Part of an amount of $30,000 was invested at 5% annual simple interest and the rest at 4% annual simple interest. If the total yearly interest from accounts was $1,400, find the amount invested at each rate.

Answers

Answer 1

An amount of $20,000 was invested at a 5% annual interest rate, while another amount of $10,000 was invested at a 4% annual interest rate. The combined annual interest earned from both investments is $1,400.

Let's assume the amount invested at 5% annual interest rate is 'x' dollars, and the amount invested at 4% annual interest rate is 'y' dollars.

According to the given information, the total amount invested is $30,000, so we have the equation:

x + y = 30,000 ----(1)

The yearly simple interest earned from the 5% investment is calculated as (5/100) * x = 0.05x dollars.

The yearly simple interest earned from the 4% investment is calculated as (4/100) * y = 0.04y dollars.

The total yearly interest earned from both investments is $1,400, so we have the equation:

0.05x + 0.04y = 1,400 ----(2)

To solve this system of equations, we can use substitution or elimination method.

Let's solve it using the elimination method:

Multiply equation (2) by 100 to eliminate decimals:

5x + 4y = 140,000 ----(3)

Now, we can subtract equation (1) from equation (3):

(5x + 4y) - (x + y) = 140,000 - 30,000

4x + 3y = 110,000 ----(4)

Now we have a new equation (4) without 'x' being eliminated.

Let's solve equations (1) and (4) simultaneously:

Multiply equation (1) by 4:

4x + 4y = 120,000 ----(5)

Subtract equation (4) from equation (5):

(4x + 4y) - (4x + 3y) = 120,000 - 110,000

y = 10,000

Substitute the value of 'y' in equation (1):

x + 10,000 = 30,000

x = 20,000

Therefore, the amount invested at 5% is $20,000, and the amount invested at 4% is $10,000.

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Related Questions

Let A and B be events with P(A)=0.6,P(B)=0.52, and P(B∣A)=0.8. Find P(A and B). P(A and B)=

Answers

The probability of events A and B occurring is 0.48.

P(A) = 0.6P(B) = 0.52P(B|A) = 0.8

To find: P(A and B)We know that, P(A and B) = P(A) * P(B|A)

On substituting the given values, P(A and B) = 0.6 * 0.8P(A and B) = 0.48

Therefore, the probability of events A and B occurring is 0.48.

The probability of an event is the possibility or likelihood that it will occur.

Probability is expressed as a fraction or a decimal number between 0 and 1, with 0 indicating that the event will never occur and 1 indicating that the event will always occur.

The probability of events A and B occurring is denoted as P(A and B).

Let A and B be two events with P(A) = 0.6, P(B) = 0.52, and P(B|A) = 0.8.

To find P(A and B), we use the formula: P(A and B) = P(A) * P(B|A)

Substituting the given values, we get: P(A and B) = 0.6 * 0.8 = 0.48

Therefore, the probability of events A and B occurring is 0.48.

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Rework problem 29 from section 2.1 of your text, invoiving the selection of numbered balls from a box. For this problem, assume the balis in the box are numbered 1 through 7 , and that an experiment consists of randomly selecting 2 balls one after another without replacement. (1) How many cutcomes does this experiment have? For the next two questions, enter your answer as a fraction. (2) What probability should be assigned to each outcome? (3) What probablity should be assigned to the event that at least one ball has an odd number?

Answers

1. There are 21 possible outcomes.

2. The probability of each outcome is: P(outcome) = 1/21

3. P(A) = 1 - P(not A) = 1 - 2/7 = 5/7

(1) We can use the formula for combinations to find the number of outcomes when selecting 2 balls from 7 without replacement:

C(7,2) = (7!)/(2!(7-2)!) = 21

Therefore, there are 21 possible outcomes.

(2) The probability of each outcome can be found by dividing the number of ways that outcome can occur by the total number of possible outcomes. Since the balls are selected randomly and without replacement, each outcome is equally likely. Therefore, the probability of each outcome is:

P(outcome) = 1/21

(3) Let A be the event that at least one ball has an odd number. We can calculate the probability of this event by finding the probability of the complement of A and subtracting it from 1:

P(A) = 1 - P(not A)

The complement of A is the event that both balls have even numbers. To find the probability of not A, we need to count the number of outcomes where both balls have even numbers. There are 4 even numbered balls in the box, so we can select 2 even numbered balls in C(4,2) ways. Therefore, the probability of not A is:

P(not A) = C(4,2)/C(7,2) = (4!/2!2!)/(7!/2!5!) = 6/21 = 2/7

So, the probability of at least one ball having an odd number is:

P(A) = 1 - P(not A) = 1 - 2/7 = 5/7

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A package of 15 pieces of candy costs $2.40. True or False: the unit rate of price per piece of candy is 16 cents for 1 piece of candy

Answers

Answer:

True

Step-by-step explanation:

Price per candy=total price/quantity

price per candy=2.40/15

2.4/15=.8/5=4/25=0.16

Thus its true

15) A={x∈Z:x is even } C={3,5,9,12,15,16} Select the true statement. a. C−A={12,16} b. C−A={3,5,9,15} c. C−A={3,5,9,12,15} d. The set C−A is infinite. 16) C={3,5,9,12,15,16} D={5,7,8,12,13,15} Select the set corresponding to C⊕D. a. {3,9,16} b. {5,12,15} c. {3,7,8,9,13,16} d. {3,5,7,8,9,12,13,15,16} 17) A={x∈Z:x is even } B={x∈Z:x is a prime number } D={5,7,8,12,13,15} Select the set corresponding to D−(A∪B). a. {15} b. {13,15} c. {8,12,15} d. {5,7,13,15}

Answers

15) The correct option is b. C−A={3,5,9,15}.

16) The correct option is c. {3,7,8,9,13,16} is the set corresponding to C⊕D.

17)  The correct option is b. {13,15} is the set corresponding to D−(A∪B)

15) The correct option is b. C−A={3,5,9,15}.

A={x∈Z:x is even } and C={3,5,9,12,15,16} are two sets.

In the set A, all even integers are included. In the set C, 3, 5, 9, 12, 15, 16 are included.

C−A represents the elements that are in set C but not in set A.

Therefore,{3,5,9,15} is the set corresponding to C−A.

16) The correct option is c. {3,7,8,9,13,16} is the set corresponding to C⊕D.

Given, C={3,5,9,12,15,16}  D={5,7,8,12,13,15}

C⊕D represents the symmetric difference of the set C and the set D. Thus, the symmetric difference of C and D is {3,7,8,9,13,16}

17)  The correct option is b. {13,15} is the set corresponding to D−(A∪B).Given,

A={x∈Z:x is even }

B={x∈Z:x is a prime number }

D={5,7,8,12,13,15}

D−(A∪B) indicates the set of elements that are present in set D but not present in (A∪B).

Now, let us find (A∪B)

A={x∈Z:x is even }= {…,−4,−2,0,2,4,…}

B={x∈Z:x is a prime number }={2,3,5,7,11,…}

Hence, (A∪B)= {…,−4,−2,0,2,3,4,5,7,11,…}

Therefore,D−(A∪B)={13,15}.

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Let f:x→yand​)g:y→z If UcZ Prove That (g∘f−1)(U)=f−1(g−1(U))

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To prove that (g∘f^(-1))(U) = f^(-1)(g^(-1))(U) for sets U, we need to show that the composition of functions g∘f^(-1) and f^(-1) yields the same result when applied to set U.

Let's break down the proof step by step:

(g∘f^(-1))(U): This represents the composition of functions g and f^(-1) applied to set U. It means that we first apply f^(-1) to U and then apply g to the result.

f^(-1)(g^(-1))(U): This represents the composition of functions f^(-1) and g^(-1) applied to set U. It means that we first apply g^(-1) to U and then apply f^(-1) to the result.

To show that these two compositions yield the same result, we need to prove that their outputs are equal.

Let's take an arbitrary element y from (g∘f^(-1))(U) and show that it also belongs to f^(-1)(g^(-1))(U), and vice versa.

Suppose y is an element of (g∘f^(-1))(U). This means there exists an x in U such that y = g(f^(-1)(x)). Applying f^(-1) to both sides, we get f^(-1)(y) = f^(-1)(g(f^(-1)(x))). Since f^(-1)(f^(-1)(x)) = x, we have f^(-1)(y) = x. Therefore, f^(-1)(y) belongs to f^(-1)(g^(-1))(U).

Suppose y is an element of f^(-1)(g^(-1))(U). This means there exists an x in U such that y = f^(-1)(g^(-1)(x)). Applying g to both sides, we get g(y) = g(f^(-1)(g^(-1)(x))). Since g(g^(-1)(x)) = x, we have g(y) = x. Therefore, g(y) belongs to (g∘f^(-1))(U).

Since any element y that belongs to one composition also belongs to the other, we can conclude that (g∘f^(-1))(U) = f^(-1)(g^(-1))(U).

This proves the desired result: (g∘f^(-1))(U) = f^(-1)(g^(-1))(U) when U is a subset of Z.

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Find the critical points of the following function. f(x)=3e^(x ^2)-4x+1

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To find the critical points of the function [tex]f(x) = 3e^{(x^2)} - 4x + 1[/tex], we first found the first derivative of f(x), which is [tex](6x e^{(x^2)}) - 4.[/tex] We then set f'(x) equal to zero and solved for x to find the critical points. We also checked if f'(x) was undefined at any point by setting the denominator of the derivative equal to zero. The critical points of f(x) are x = 0 and x = 2/3.

The critical points of the function [tex]f(x) = 3e^{(x^2)} - 4x + 1[/tex] are determined by finding the values of x for which the first derivative of f(x) is zero or undefined.

To find the first derivative of f(x), use the following formula:  [tex]f'(x) = (6x e^{(x^2)}) - 4.[/tex] The critical points are where f'(x) is equal to zero or undefined.

Set f'(x) = 0 and solve for x: [tex](6x e^{(x^2)}) - 4 = 0(6x e^{(x^2)}) = 4x e^{(x^2)} = x = 2/3[/tex]

To determine if f'(x) is undefined at any points, set the denominator of the derivative equal to zero and solve:6x e^(x^2) = 0x = 0

The critical points of f(x) are x = 0 and x = 2/3. At x = 0, the derivative is negative and switches to positive at x = 2/3, indicating a local minimum.

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Suppose the annual salaries for sales associates from a particular store have a mean of 529.093 and a standard deviation of $1,306. If we dont know anything about the distribution of annual salaries. What is the maximum percentage of salaries above $31.6522 ? Round your answer to two decimal places and report your response as a percentage (eg: 95 25).

Answers

The maximum percentage of salaries above $31.6522 is 35.25% (rounded to two decimal places).

Given that the mean of the annual salaries of sales associates is $529.093 and the standard deviation is $1,306 and we don't know anything about the distribution of annual salaries.

To find the maximum percentage of salaries above $31.6522, we need to find the z-score of this value.

z-score formula is:

z = (x - μ) / σ

Where, x = $31.6522, μ = 529.093, σ = 1306

So, z = (31.6522 - 529.093) / 1306

z = -0.3834

The percentage of salaries above $31.6522 is the area under the standard normal distribution curve to the right of the z-score of $31.6522.

Therefore, the maximum percentage of salaries above $31.6522 is 35.25% (rounded to two decimal places).

Hence, the required answer is 35.25%.

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h(x)=(-5+x)(5+x) g(x)=-5-7x (b) Find all values that are NOT in the domain of (h)/(g). If there is more than one value, separate them with commas.

Answers

The domain of a function is all the real numbers x that can be input into the function without causing any undefined or impossible results.

For a fraction or division, the denominator cannot be equal to zero. In other words, the denominator cannot be zero. Let's first determine the domain of g(x) which is a linear function. It is defined for all x. Hence, the domain of g(x) is all real numbers. The given function h(x) is a multiplication of two quadratic functions. Hence, the domain of h(x) is all real numbers.

For h(x)/g(x) to be undefined, the denominator should be equal to zero. g(x) = -5 - 7x can be zero if

x = (-5)/7.

If we substitute x = (-5)/7 in the expression of h(x),

then we get h((-5)/7) = 0.

The formula for calculating the division of functions is given by f(x) / g(x). We will write the given functions in a simplified form, h(x) = -x^2 + 25 and

The denominator g(x) = -5 - 7x should not be equal to 0.

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Suppose the average yearty salary of an individual whose final degree is a master's is $43 thousand lens than twice that of an intlividual whose finat degree is a hachelar's: Combined, two people with each of these educational atiainments eam $113 thousand Find the average yearly salary of an individual with each of these final degrees. The average yearly walary for an individual whose final degree is a bacheor's is 1 thousiand and the average yearly salary fot an indivioual whose final begren is a manteris is thounand

Answers

The average yearly salary for an individual with a bachelor's degree is $45,000, while the average yearly salary for an individual with a master's degree is $68,000 is obtained by Equations and Systems of Equations.

These figures are derived from the given information that the combined salaries of individuals with these degrees amount to $113,000. Understanding the average salaries based on educational attainment helps in evaluating the economic returns of different degrees and making informed decisions regarding career paths and educational choices.

Let's denote the average yearly salary for an individual with a bachelor's degree as "B" and the average yearly salary for an individual with a master's degree as "M". According to the given information, the average yearly salary for an individual with a bachelor's degree is $1,000, and the average yearly salary for an individual with a master's degree is $1,000 less than twice that of a bachelor's degree.

We can set up the following equations based on the given information:

B = $45,000 (average yearly salary for a bachelor's degree)

M = 2B - $1,000 (average yearly salary for a master's degree)

The combined salaries of individuals with these degrees amount to $113,000:

B + M = $113,000

Substituting the expressions for B and M into the equation, we get:

$45,000 + (2B - $1,000) = $113,000

Solving the equation, we find B = $45,000 and M = $68,000. Therefore, the average yearly salary for an individual with a bachelor's degree is $45,000, and the average yearly salary for an individual with a master's degree is $68,000.

Understanding the average salaries based on educational attainment provides valuable insights into the economic returns of different degrees. It helps individuals make informed decisions regarding career paths and educational choices, considering the potential financial outcomes associated with each degree.

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Consider a family of functions f(x)=kx m
(1−x) n
where m>0,n>0 and k is a constant chosen such that ∫ 0
1

f(x)dx=1 These functions represent a class of probability distributions, called beta distributions, where the probability of a quantity x lying between a and b (where 0≤a≤b≤1 ) is given by P a,b

=∫ a
b

f(x)dx The median of a probability distribution is the value b such that the probability that b≤x≤1 is equal to 2
1

=50%. The expected value of one of these distributions is given by ∫ 0
1

xf(x)dx Suppose information retention follows a beta distribution with m=1 and n= 2
1

. Consider an experiment where x measures the percentage of information students retain from their Calculus I course. 1. Find k. 2. Calculate the probability a randomly selected student retains at least 50% of the information from their Calculus I course. 3. Calculate the median amount of information retained. 4. Find the expected percentage of information students retain.

Answers

The function f(x) is defined as kxm(1-x)n, with an integral of 1. To find k, integrate and solve for k. The probability of a student retaining at least 50% of information from Calculus I is P(1/2, 1) = ∫1/2 1 f(x) dx = 0.5.

1. Find kThe family of functions is given as:f(x) = kxm(1-x)nThe integral of this function within the given limits [0, 1] is equal to 1.

Therefore,∫ 0 1 f(x) dx = 1We need to find k.Using the given family of functions and integrating it, we get∫ 0 1 kxm(1-x)n dx = 1Now, substitute the values of m and n to solve for k:

∫ 0 1 kx(1-x)dx

= 1∫ 0 1 k(x-x^2)dx

= 1∫ 0 1 kx dx - ∫ 0 1 kx^2 dx

= 1k/2 - k/3

= 1k/6

= 1k

= 6

Therefore, k = 6.2. Calculate the probability a randomly selected student retains at least 50% of the information from their Calculus I course.Suppose information retention follows a beta distribution with m = 1 and n = 21​.

The probability of a quantity x lying between a and b (where 0 ≤ a ≤ b ≤ 1) is given by:P(a, b) = ∫a b f(x) dxFor P(b, 1) = 1/2, the value of b is the median of the beta distribution. So we can write:P(b, 1) = ∫b 1 f(x) dx = 1/2Since the distribution is symmetric,

∫ 0 b f(x) dx

= 1/2

Differentiating both sides with respect to b: f(b) = 1/2Here, f(x) is the probability density function for x, which is:

f(x) = kx m(1-x) n

So, f(b) = kb (1-b)21​ = 1/2Substituting the value of k, we get:6b (1-b)21​ = 1/2Solving for b, we get:b = 1/2

Therefore, the probability that a randomly selected student retains at least 50% of the information from their Calculus I course is:

P(1/2, 1)

= ∫1/2 1 f(x) dx

= ∫1/2 1 6x(1-x)21​ dx

= 0.5.

Calculate the median amount of information retained.

The median is the value of b such that the probability that b ≤ x ≤ 1 is equal to 21​.We found b in the previous part, which is:b = 1/2Therefore, the median amount of information retained is 1/2.4. Find the expected percentage of information students retain.The expected value of one of these distributions is given by:∫ 0 1 xf(x) dxWe know that f(x) = kx m(1-x) nSubstituting the values of k, m, and n, we get:f(x) = 6x(1-x)21​Therefore,∫ 0 1 xf(x) dx= ∫ 0 1 6x^2(1-x)21​ dx= 2/3Therefore, the expected percentage of information students retain is 2/3 or approximately 67%.

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f(x)=x(x-1) g(x)=x The functions f and g are defined above. What are all values of x for which f(x) ?

Answers

The functions f and g are defined as follows:f(x) = x(x - 1)g(x) = xTo determine all values of x for which f(x) < g(x).

We can first expand f(x) and simplify the inequality:

f(x) < g(x)x(x - 1) < xx^2 - x < x0 < x

The last inequality is equivalent to x > 0 or x < 1,

which means that all values of x outside the interval (0, 1) satisfy f(x) < g(x).

In other words, the inequality holds for x < 0 and x > 1.

The function f(x) intersects with the function g(x) at the point (1, 1).

For x < 0, we have f(x) < 0 and g(x) < 0, so the inequality holds.

For x > 1, we have f(x) > g(x) > 0, so the inequality holds.

Hence, all values of x that satisfy f(x) < g(x) are given by:x < 0 or x > 1.

To summarize, the inequality

f(x) < g(x) holds for all values of x outside the interval (0, 1), i.e., x < 0 or x > 1.

The answer is more than 100 words, as requested.

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A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400m in 20 s. Fard ats acceleration. Find the force acting on it if its mass is 7 metric tonnes (H

Answers

The force and acceleration acting on a truck rolling down a hill will be determined below;

A truck rolls down a hill with a constant acceleration and travels a distance of 400m in 20 seconds.

Calculate its acceleration.

The acceleration formula is given as;a = (v - u)/t;

Where;v = final velocity, u = initial velocity, t = time, a = acceleration

The truck starts from rest and so, the initial velocity is zero.

Substituting this value into the acceleration formula;

a = (v - u)/t;

a = (400m - 0m)/20s

a = 400m/20s;

a = 20m/s²

Thus, the truck's acceleration is 20m/s².

Find the force acting on it if its mass is 7 metric tonnes (H).

The force formula is given as;

F = ma;

Where;m = mass. t = time, a = acceleration

Substituting the given values;

F = ma

F = 7 metric tonnes x 1000 kg/metric tonne x 20m/s²

F = 1.4 x 10⁵N

Thus, the force acting on the truck is 1.4 x 10⁵N.

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cenario 1: an analyst wants to test the hypothesis that the percentage of homeowners in the us population is 75%. in order to test this hypothesis she collects data from all over the country. your task is to help the analyst perform her hypothesis test. in order to do this you need to compute various statistics using excel. use 5% level of significance.

Answers

The null hypothesis is rejected if the absolute value of the test statistic is greater than 1.96, If the absolute value of the test statistic is less than or equal to 1.96, we fail to reject the null hypothesis.

Null hypothesis (H0): The percentage of homeowners in the US population is 75%.

Alternative hypothesis ([tex]H_1[/tex]): The percentage of homeowners in the US population is not equal to 75%.

The analyst has collected data from all over the country. Let's assume she has a sample size [tex]n[/tex] and the number of homeowners in the sample is [tex]x[/tex].

The task mentions a 5% level of significance, which means we will reject the null hypothesis if the probability of observing the data given that the null hypothesis is true is less than 5%.

To perform the hypothesis test, we can use the [tex]z[/tex]-test since we have a large sample size The formula for the z-test statistic is:

[tex]z = \dfrac{(x - np)} {\sqrt{(npq})},[/tex]

where [tex]np[/tex]  is the expected number of homeowners[tex](n \times 0.75)[/tex]), [tex]q\\[/tex] is the complement of [tex]p (1 - p)[/tex]), and sqrt denotes the square root.

The critical value is:

Since the significance level is 5%, we need to find the critical value for a two-tailed test. For a 5% level of significance, the critical z-value is[tex]+1.96[/tex]

On Comparing the test statistic with the critical value:

The null hypothesis is rejected if the test is static if the absolute value of the test statistic is greater than 1.96

If the absolute value of the test statistic is less than or equal to 1.96, we fail to reject the null hypothesis.

Based on the comparison between the test statistic and the critical value, we can make conclusions about the hypothesis.

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A one parameter family (with parameter c ) of solutions to the problem y′+2xy2=0 is y=1/(x2+c) (1) Find c so that y(−2)=−1 c=_____ (2) Find c so that y(2)=3 c=______

Answers

We are given the differential equation y′+ 2xy^2 = 0, and we want to find a one-parameter family of solutions to this equation.

Using separation of variables, we can write:

dy/y^2 = -2x dx

Integrating both sides, we get:

-1/y = x^2 + c

where c is an arbitrary constant of integration.

Solving for y, we get:

y = 1/(x^2 + c)

Now, we can use the initial conditions to find the value of c.

(1) We are given that y(-2) = -1. Substituting these values into the solution gives:

-1 = 1/((-2)^2 + c)

-1 = 1/(4 + c)

-4 - 4c = 1

c = -5/4

So the value of c that satisfies the first initial condition is c = -5/4.

(2) We are given that y(2) = 3. Substituting these values into the solution gives:

3 = 1/(2^2 + c)

3 = 1/(4 + c)

12 + 3c = 1

c = -11/3

So the value of c that satisfies the second initial condition is c = -11/3.

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What is the quotient of the fractions below?
3 2
5
3
Ο Α.
26
B.
B. 9
10
OC.
9
532
OD. 5

Answers

The quotient of the fraction, 3 / 5 ÷ 2 / 3 is 9 / 10.

How to find quotient of a fraction?

The number we obtain when we divide one number by another is the quotient.

In other words,  a quotient is a resultant number when one number is divided by the other number.

Therefore, let's find the quotient of the fraction as follows:

3 / 5 ÷ 2 / 3

Hence, let's change the sign as follows:

3 / 5 × 3 / 2 = 9 / 10 = 9 / 10

Therefore, the quotient is 9 / 10.

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A passport photo should have the dimensions 4.5× 3.5cm. A photo printer is set such that the margin of error on the length is 0.2mm and on the width is 0.1 mm. What is the area (in mm^(2) ) of the largest photo printed by the machine? Give your answer to one

Answers

The area of the largest photo printed by the machine is 1587.72 mm².

Given,

The length of the photo is 4.5 cm

The breadth of the photo is 3.5 cm

The margin of error on the length is 0.2 mm

The margin of error on the width is 0.1 mm

To find, the area of the largest photo printed by the machine. We know that,1 cm = 10 mm. Therefore,

Length of the photo = 4.5 cm

                                  = 4.5 × 10 mm

                                  = 45 mm

Breadth of the photo = 3.5 cm

                                   = 3.5 × 10 mm

                                   = 35 mm

Margin of error on the length = 0.2 mm

Margin of error on the breadth = 0.1 mm

Therefore,

the maximum length of the photo = Length of the photo + Margin of error on the length

                                                        = 45 + 0.2 = 45.2 mm

Similarly, the maximum breadth of the photo = Breadth of the photo + Margin of error on the breadth

                                                        = 35 + 0.1 = 35.1 mm

Therefore, the area of the largest photo printed by the machine = Maximum length × Maximum breadth

                                  = 45.2 × 35.1

                                  = 1587.72 mm²

Area of the largest photo printed by the machine is 1587.72 mm².

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For each survey in Exercises 1-31, describe the target population, sampling frame, sampling unit, and observation unit. Discuss any possible sources of selection bias or inaccuracy of responses. 18. The U.S. National Intimate Partner and Sexual Violence Survey was launched in 2010 to assess sexual violence, stalking, and intimate partner violence victimization among adult men and women. The survey was conducted by telephone, and two sampling frames were used. The landline telephone frame consisted of hundred-banks of telephone numbers in which at least one of the numbers in the bank was known to be residential. (A hundredbank is the set of hundred numbers in which the area code and first five digits are fixed, and the last two digits take on any value between 00 and 99.) Numbers known to belong to businesses were excluded. The cellular telephone phone frame consisted of telephone banks known to be in use for cell phones. In 2010, of the 201,881 landline and cell telephone numbers sampled, approximately 31% were ineligible (for example, they belonged to a business or were nonworking numbers). Another 53% were of unknown eligibility (usually because no one answered the telephone). When someone from an eligible household answered, the adult with the most recent birthday was asked to take the survey. From the 31,241 households determined to be eligible, a total of 18,049 persons were interviewed, of whom 16,507 completed the survey (U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 2014).

Answers

The target population of the survey is adult men and women in the United States, specifically aimed at assessing , stalking, and partner

Sampling frame: The survey utilized two sampling frames. The first frame was a landline telephone frame consisting of hundred-banks of residential telephone numbers. The second frame was a cellular telephone frame consisting of telephone banks known to be in use for cell phones.

Sampling unit: The sampling unit for this survey is the telephone number, both landline and cellular, that was included in the sampling frames.

Observation unit: The observation unit for this survey is the individual adult who answered the telephone in an eligible household and completed the survey.

Possible sources of selection bias or inaccuracy of responses: There are several potential sources of bias and inaccuracy in this survey. First, the exclusion of numbers known to belong to businesses may introduce bias by underrepresenting individuals who primarily use business phone lines. Second, the large proportion of unknown eligibility (53%) due to unanswered calls may introduce non-response bias if those who did not answer have different characteristics compared to those who did answer. Third, using the adult with the most recent birthday as the respondent introduces a potential bias if certain demographic groups are more likely to be selected based on this criterion.

. The survey used two sampling frames, landline and cellular telephone frames, with telephone numbers as the sampling unit. The observation unit was the individual adult who answered the telephone in eligible households. Possible sources of bias include the exclusion of business numbers, non-response due to unanswered calls, and the selection of respondents based on the most recent birthday.

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Janae gets paid $15 an hour. She started with
$400.
Let x = number of hours Janae works
Let y = Janae's total bank account balance
If Janae works 36 hours this week, how
much money will she have by the end?

Answers

Answer:

how much money will she have by the end?

400 + 15*36= 940$

Step-by-step explanation:

Solve the differential equation (x2+y2)dx=−2xydy. 2. (5pt each) Solve the differential equation with initial value problem. (2xy−sec2x)dx+(x2+2y)dy=0,y(π/4)=1

Answers

This is the particular solution to the given differential equation with the initial condition y(π/4) = 1.

To solve the differential equation (x + y²)dx = -2xydy, we can use the method of exact equations.

1. Rearrange the equation to the form M(x, y)dx + N(x, y)dy = 0, where M(x, y) = (x² + y²) and N(x, y) = -2xy.

2. Check if the equation is exact by verifying if ∂M/∂y = ∂N/∂x. In this case, we have:
∂M/∂y = 2y
∂N/∂x = -2y

Since ∂M/∂y = ∂N/∂x, the equation is exact.

3. Find a function F(x, y) such that ∂F/∂x = M(x, y) and ∂F/∂y = N(x, y).

Integrating M(x, y) with respect to x gives:
F(x, y) = (1/3)x + xy² + g(y), where g(y) is an arbitrary function of y.

4. Now, differentiate F(x, y) with respect to y and equate it to N(x, y):
∂F/∂y = x² + 2xy + g'(y) = -2xy

From this equation, we can conclude that g'(y) = 0, which means g(y) is a constant.

5. Substituting g(y) = c, where c is a constant, back into F(x, y), we have:
F(x, y) = (1/3)x³ + xy² + c

6. Set F(x, y) equal to a constant, say C, to obtain the solution of the differential equation:
(1/3)x³ + xy² + c = C

This is the general solution to the given differential equation.

Moving on to the second part of the question:

To solve the differential equation with the initial value problem (2xy - sec²(x))dx + (x² + 2y)dy = 0, y(π/4) = 1:

1. Follow steps 1 to 5 from the previous solution to obtain the general solution: (1/3)x³ + xy² + c = C.

2. To find the particular solution that satisfies the initial condition, substitute y = 1 and x = π/4 into the general solution:
(1/3)(π/4)³ + (π/4)(1)² + c = C

Simplifying this equation, we have:
(1/48)π³ + (1/4)π + c = C

This is the particular solution to the given differential equation with the initial condition y(π/4) = 1.

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help
For two events, M and N, P(M)=0.7, P(N \mid M)=0.4 , and P\left(N \mid M{ }^{\prime}\right)=0.4 . Find P\left(M^{\prime} \mid N^{\prime}\right) . P\left(M^{\prime} \mid N^{\pri

Answers

We can use Bayes' theorem to find P(M' | N'):

P(N) = P(N | M)P(M) + P(N | M')P(M')

Since P(N | M) + P(N | M') = 1, we have:

P(N) = 0.4(0.7) + 0.4(P(M')) = 0.28 + 0.4P(M')

0.4P(M') = P(N) - 0.28

P(M') = (P(N) - 0.28)/0.4

Now, we can use Bayes' theorem again to find P(M' | N'):

P(N') = P(N' | M)P(M) + P(N' | M')P(M')

Since P(N') = 1 - P(N), we have:

1 - P(N) = P(N' | M)P(M) + P(N' | M')P(M')

0.3 = 0.6P(M) + P(N' | M')[(P(N) - 0.28)/0.4]

0.3 - 0.6P(M) = P(N' | M')[(P(N) - 0.28)/0.4]

P(N' | M') = [0.3 - 0.6P(M)]*0.4/(P(N) - 0.28)

Substituting the given values, we get:

P(N' | M') = [0.3 - 0.6(0.7)]*0.4/(1 - 0.28) = 0.04

Therefore, P(M' | N') = P(N' | M')*P(M')/P(N'):

P(M' | N') = 0.04*(P(N) - 0.28)/0.3 = 0.04*(0.72)/0.3 = 0.096

So, P(M' | N') is approximately 0.096.

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2. Define T-conductor. Prove its existence and divisibility with minimal polynomial for T. [3]

Answers

r(x) is a non-zero polynomial of degree less than k which annihilates T, contradicting the minimality of p(x) as a T-conductor. Therefore, we must have r(x) = 0, and thus p(x) is divisible by m_T(x).

Let V be a finite-dimensional vector space over a field F, and let T be a linear operator on V. A T-conductor is a non-zero polynomial p(x) in F[x] such that:

p(T) = 0 (the zero transformation)

The degree of p(x) is minimal among all non-zero polynomials q(x) in F[x] such that q(T) = 0.

To prove the existence of a T-conductor, we can use the fact that every non-zero linear operator T on a finite-dimensional vector space V has a minimal polynomial m_T(x) in F[x]. The minimal polynomial of T is defined as the unique monic polynomial of minimal degree which annihilates T, i.e., satisfies m_T(T) = 0.

We can show that the minimal polynomial of T is also a T-conductor. To see this, note that the minimal polynomial of T satisfies condition 1 above, since m_T(T) = 0 by definition. Moreover, the degree of m_T(x) is minimal among all monic polynomials q(x) in F[x] such that q(T) = 0, by the very definition of the minimal polynomial.

To prove the divisibility of the T-conductor by the minimal polynomial for T, let p(x) be a T-conductor of minimal degree k, and let m_T(x) be the minimal polynomial of T. Then we have p(T) = 0 and m_T(T) = 0. Since p(x) is a T-conductor, it follows that m_T(x) divides p(x), by the minimality of k.

To see why m_T(x) divides p(x), we can use the division algorithm for polynomials:

p(x) = q(x) * m_T(x) + r(x)

where the degree of r(x) is less than the degree of m_T(x). Applying both sides to T, we get:

0 = p(T) = q(T) * m_T(T) + r(T)

Since m_T(T) = 0, we have:

0 = q(T) * 0 + r(T)

r(T) = 0

This means that r(x) is a non-zero polynomial of degree less than k which annihilates T, contradicting the minimality of p(x) as a T-conductor. Therefore, we must have r(x) = 0, and thus p(x) is divisible by m_T(x).

Hence, we have proved the existence of a T-conductor and shown that it is divisible by the minimal polynomial of T.

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The domain for all variables in this problem consists of all integers. Which of the following propositions are true? Select all that apply. A. ∃n∀m(mn=2n) B. ∃m∀n(m−n=n) C. ∀m∀n(mn=2n) D. ∀m∃n(mn=2n) E. ∀m∀n(m2⩾−n2) F. ∀m∃n(−m2⩾n2)

Answers

The propositions that are true for the given domain of all integers are, A. [tex](\forall m\forall n(mn = 2n))[/tex], D. [tex](\forall m\forall n(mn = 2n))[/tex] and E. [tex](\forall m\forall n(m^2 \ge -n^2))[/tex] . These propositions hold true because they satisfy the given conditions for all possible integer values of m and n.

Proposition A. [tex](\forall m\forall n(mn = 2n))[/tex], states that there exists an integer n such that for all integers m, the equation mn = 2n holds. This proposition is true because we can choose n = 0, and for any integer m, [tex]0 * m = 2^0 = 1[/tex], which satisfies the equation.

For proposition D. [tex](\forall m\forall n(mn = 2n))[/tex], it states that for all integers m, there exists an integer n such that the equation mn = 2n holds. This proposition is true because, for any integer m, we can choose n = 0, and [tex]0 * m = 2^0 = 1[/tex], which satisfies the equation.

For proposition E. [tex](\forall m\forall n(m^2 \ge -n^2))[/tex], it states that for all integers m and n, the inequality [tex]m^2 \ge -n^2[/tex] holds. This proposition is true because the square of any integer is always non-negative, and the negative square of any integer is also non-positive, thus satisfying the inequality.

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Find the area under the standard normal probability distribution between the following pairs of z-scores.
a. z=0 and z = 3.00
b. z=0 and z = 1.00
c. z=0 and z = 2.00
d. z=0 and z = 0.62
Click here to view a table of areas under the standardized normal curve.
a. The area under the standard normal probability distribution is 0.499 (Round to three decimal places as needed.)
.
b. The area under the standard normal probability distribution is 0.341. (Round to three decimal places as needed.)
c. The area under the standard normal probability distribution (Round to three decimal places as needed.)
is 0.477.
d. The area under the standard normal probability distribution is N
(Round to three decimal places as needed.)

Answers

To find the area under the standard normal probability distribution between the given pairs of z-scores, we can use a standard normal distribution table or a statistical software.

Here are the calculated values:

a. The area under the standard normal probability distribution between z = 0 and z = 3.00 is approximately 0.499. (Rounded to three decimal places.)

b. The area under the standard normal probability distribution between z = 0 and z = 1.00 is approximately 0.341. (Rounded to three decimal places.)

c. The area under the standard normal probability distribution between z = 0 and z = 2.00 is approximately 0.477. (Rounded to three decimal places.)

d. The area under the standard normal probability distribution between z = 0 and z = 0.62 is approximately 0.232. (Rounded to three decimal places.)

Please note that for part d, the exact value may vary depending on the level of precision used.

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a. The product of any three consecutive integers is divisible by \( 6 . \) (3 marks)

Answers

The statement is true. The product of any three consecutive integers is divisible by 6.

To prove this, we can consider three consecutive integers as \( n-1, n, \) and \( n+1, \) where \( n \) is an integer.

We can express these integers as follows:

\( n-1 = n-2+1 \)

\( n = n \)

\( n+1 = n+1 \)

Now, let's calculate their product:

\( (n-2+1) \times n \times (n+1) \)

Expanding this expression, we get:

\( (n-2)n(n+1) \)

From the properties of multiplication, we know that the order of multiplication does not affect the product. Therefore, we can rearrange the terms to simplify the expression:

\( n(n-2)(n+1) \)

Now, let's analyze the factors:

- One of the integers is divisible by 2 (either \( n \) or \( n-2 \)) since consecutive integers alternate between even and odd.

- One of the integers is divisible by 3 (either \( n \) or \( n+1 \)) since consecutive integers leave a remainder of 0, 1, or 2 when divided by 3.

Therefore, the product \( n(n-2)(n+1) \) contains factors of both 2 and 3, making it divisible by 6.

Hence, we have proven that the product of any three consecutive integers is divisible by 6.

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Below you will find pairs of statements A and B. For each pair, please indicate which of the following three sentences are true and which are false: - If A, then B - If B, then A. - A if and only B. (a) A: Polygon PQRS is a rectangle. B : Polygon PQRS is a parallelogram. (b) A: Joe is a grandfather. B : Joe is male. For the remaining items, x and y refer to real numbers. (c) A:x>0B:x 2
>0 (d) A:x<0B:x 3
<0

Answers

(a) 1. If A, then B: True

2. If B, then A: False

3. A if and only B: False

(a) If a polygon PQRS is a rectangle, it is also a parallelogram, as all rectangles are parallelograms.

Therefore, the statement "If A, then B" is true. However, if a polygon is a parallelogram, it does not necessarily mean it is a rectangle, as parallelograms can have other shapes. Hence, the statement "If B, then A" is false. The statement "A if and only B" is also false since a rectangle is a specific type of parallelogram, but not all parallelograms are rectangles. Therefore, the correct answer is: If A, then B is true, If B, then A is false, and A if and only B is false.

(b) 1. If A, then B: True

2. If B, then A: False

3. A if and only B: False

(b) If Joe is a grandfather, it implies that Joe is male, as being a grandfather is a role that is typically associated with males. Therefore, the statement "If A, then B" is true. However, if Joe is male, it does not necessarily mean he is a grandfather, as being male does not automatically make someone a grandfather. Hence, the statement "If B, then A" is false. The statement "A if and only B" is also false since being a grandfather is not the only condition for Joe to be male. Therefore, the correct answer is: If A, then B is true, If B, then A is false, and A if and only B is false.

(c) 1. If A, then B: True

2. If B, then A: True

3. A if and only B: True

(c) If x is greater than 0 (x > 0), it implies that x squared is also greater than 0 (x^2 > 0). Therefore, the statement "If A, then B" is true. Similarly, if x squared is greater than 0 (x^2 > 0), it implies that x is also greater than 0 (x > 0). Hence, the statement "If B, then A" is also true. Since both statements hold true in both directions, the statement "A if and only B" is true. Therefore, the correct answer is: If A, then B is true, If B, then A is true, and A if and only B is true.

(d) 1. If A, then B: False

2. If B, then A: False

3. A if and only B: False

(d) If x is less than 0 (x < 0), it does not imply that x cubed is less than 0 (x^3 < 0). Therefore, the statement "If A, then B" is false. Similarly, if x cubed is less than 0 (x^3 < 0), it does not imply that x is less than 0 (x < 0). Hence, the statement "If B, then A" is false. Since neither statement holds true in either direction, the statement "A if and only B" is also false. Therefore, the correct answer is: If A, then B is false, If B, then A is false, and A if and only B is false.

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suppose that at ccny, 35% of students are international students. what is the probability that 40 students out of a randomly sampled group of 100 are international students? a. 0.1473 b. 0.1041 c. none of these d. 0.8528 e. 0.0483

Answers

Probability that 40 students out of a randomly sampled group of 100 are international students is 0.0483

Given,

35% of students are international students.

40 students out of a randomly sampled group of 100 are international students .

Now,

According to the relation,

n = 100

P(X = x) = [tex]n{C}_x P^{x} (1-P)^{n-x}[/tex]

Substituting the values,

P = 35% = 0.35

P(X = 40) = [tex]100C_{40}(0.35)^{40} (1-0.35)^{100-40}[/tex]

P(X = 40) = 0.0483

Thus option E is correct.

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Add all items in 1 to s using the correct set method. s={ "apple", "banana", "cherry" } I= ["orange", "mango", "grapes"]
Previous question

Answers

To add all items in 1 to s using the correct set method where s = { "apple", "banana", "cherry" } and I = ["orange", "mango", "grapes"], we can use the union() method of the set.

The union() method returns a set containing all items from both the original set and the specified iterable(s), i.e., it creates a new set by adding all the items from the given set and the iterable (s).

Here is the syntax for the union() method: set.union(set1, set2, set3...)where set1, set2, set3, ... are the sets to be merged, and set is the set that will contain all the items.

Here's how to use the union() method to add all the items in 1 to s:```s = { "apple", "banana", "cherry" }I = ["orange", "mango", "grapes"]s = s.union(I) print(s)```Output:{'banana', 'apple', 'grapes', 'mango', 'cherry', 'orange'}

As you can see, all the items in I have been added to the set s.

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Taylor and Miranda are performing on a magic dimension-changing
stage that is 20 feet long by 15 feet width. The length is
decreasing linearly with time at a rate of 2 feet per hour and
width is incre

Answers

- The stage will have the maximum area after 2.5 hours.

- The stage will disappear after 10 hours.

To determine when the stage will have the maximum area, we can calculate the rate of change of the area with respect to time. The area of the stage is given by the product of its length and width:

Area = Length * Width

Let's denote the length of the stage as L(t) and the width as W(t), where t represents time in hours. Given that the length is decreasing at a rate of 2 feet per hour and the width is increasing at a rate of 3 feet per hour, we can express L(t) and W(t) as:

L(t) = 20 - 2t

W(t) = 15 + 3t

Now, we can express the area A(t) as a function of time:

A(t) = L(t) * W(t) = (20 - 2t) * (15 + 3t)

To find the time when the stage has the maximum area, we can differentiate A(t) with respect to time and set it to zero:

dA(t)/dt = 0

Let's differentiate A(t) and solve for t:

dA(t)/dt = (20 - 2t) * 3 + (15 + 3t) * (-2) = 0

60 - 6t - 30 - 6t = 0

-12t = -30

t = 2.5

So, the stage will have the maximum area after 2.5 hours.

To determine when the stage will disappear, we need to find the time at which the area becomes zero. Setting A(t) to zero, we have:

A(t) = (20 - 2t) * (15 + 3t) = 0

This equation will be true when either (20 - 2t) or (15 + 3t) is zero. Solving each equation separately:

20 - 2t = 0

-2t = -20

t = 10

15 + 3t = 0

3t = -15

t = -5

Since time cannot be negative, we discard t = -5. Therefore, the stage will disappear after 10 hours.

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The complete question is:

Taylor and Miranda are performing on a magic dimension-changing stage that is 20 feet long by 15 feet width. The length is decreasing linearly with time at a rate of 2 feet per hour and width is increasing linearly with time at a rate of 3 feet per hour. When will the stage have the maximum area, and when will the stage disappear (has 0 square feet)?

The frequency table shown records daily sales for 200 days at alpha=0.05 do sales appear to be normally distributed ?
sales frequency
40 upto 60 7
60 upto 80 22
80 upto 100 46
100 upto 120 42
120 upto 140 42
140 upto 160 18
160 upto 180 11
180 upto 200 12

Answers

The calculated test statistic (12.133) is less than the critical value (14.067), we fail to reject the null hypothesis. Therefore, based on this test, the sales data does not provide strong.Based on this test, the sales data does not provide strong.

To determine whether the sales data appears to be normally distributed, we can perform a chi-square goodness-of-fit test. The steps for conducting this test are as follows:

Set up the null and alternative hypotheses:

Null hypothesis (H0): The sales data follows a normal distribution.

Alternative hypothesis (Ha): The sales data does not follow a normal distribution.

Determine the expected frequencies for each category under the assumption of a normal distribution. Since the data is grouped into intervals, we can calculate the expected frequencies using the cumulative probabilities of the normal distribution.

Calculate the test statistic. For a chi-square goodness-of-fit test, the test statistic is calculated as:

chi-square = Σ((Observed frequency - Expected frequency)^2 / Expected frequency)

Determine the degrees of freedom. The degrees of freedom for this test is given by the number of categories minus 1.

Determine the critical value or p-value. With a significance level of 0.05, we can compare the calculated test statistic to the critical value from the chi-square distribution or calculate the p-value associated with the test statistic.

Make a decision. If the calculated test statistic is greater than the critical value or the p-value is less than the significance level (0.05), we reject the null hypothesis. Otherwise, we fail to reject the null hypothesis.

Now, let's perform the calculations for this specific example:

First, let's calculate the expected frequencies assuming a normal distribution. Since the intervals are not symmetric around the mean, we need to use the cumulative probabilities to calculate the expected frequencies for each interval.

For the interval "40 upto 60":

Expected frequency = (60 - 40) * (Φ(60) - Φ(40))

= 20 * (0.8413 - 0.0228)

≈ 16.771

Similarly, we can calculate the expected frequencies for the other intervals:

60 upto 80: Expected frequency ≈ 30.404

80 upto 100: Expected frequency ≈ 42.231

100 upto 120: Expected frequency ≈ 42.231

120 upto 140: Expected frequency ≈ 30.404

140 upto 160: Expected frequency ≈ 16.771

160 upto 180: Expected frequency ≈ 7.731

180 upto 200: Expected frequency ≈ 6.487

Next, we calculate the test statistic using the formula mentioned earlier:

chi-square = ((7 - 16.771)^2 / 16.771) + ((22 - 30.404)^2 / 30.404) + ((46 - 42.231)^2 / 42.231) + ((42 - 42.231)^2 / 42.231) + ((42 - 30.404)^2 / 30.404) + ((18 - 16.771)^2 / 16.771) + ((11 - 7.731)^2 / 7.731) + ((12 - 6.487)^2 / 6.487)

≈ 12.133

The degrees of freedom for this test is given by the number of categories minus 1, which is 8 - 1 = 7.

Using a chi-square distribution table or a calculator, we can find the critical value associated with a significance level of 0.05 and 7 degrees of freedom. Let's assume the critical value is approximately 14.067.

Since the calculated test statistic (12.133) is less than the critical value (14.067), we fail to reject the null hypothesis. Therefore, based on this test, the sales data does not provide strong.

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Rank the following functions by order of growth; that is, find an arrangement g 1

,g 2

,g 3

,…,g 6

of the functions katisfying g 1

=Ω(g 2

),g 2

=Ω(g 3

),g 3

=Ω(g 4

),g 4

=Ω(g 5

),g 5

=Ω(g 6

). Partition your list in equivalence lasses such that f(n) and h(n) are in the same class if and only if f(n)=Θ(h(n)). For example for functions gn,n,n 2
, and 2 lgn
you could write: n 2
,{n,2 lgn
},lgn.

Answers

To rank the given functions by order of growth and partition them into equivalence classes, we need to compare the growth rates of these functions. Here's the ranking and partition:

1. g6(n) = 2^sqrt(log(n)) - This function has the slowest growth rate among the given functions.

2. g5(n) = n^3/2 - This function grows faster than g6(n) but slower than the remaining functions.

3. g4(n) = n^2 - This function grows faster than g5(n) but slower than the remaining functions.

4. g3(n) = n^2log(n) - This function grows faster than g4(n) but slower than the remaining functions.

5. g2(n) = n^3 - This function grows faster than g3(n) but slower than the remaining function.

6. g1(n) = 2^n - This function has the fastest growth rate among the given functions.
Equivalence classes:

The functions can be partitioned into the following equivalence classes based on their growth rates:

{g6(n)} - Functions with the slowest growth rate.

{g5(n)} - Functions that grow faster than g6(n) but slower than the remaining functions.

{g4(n)} - Functions that grow faster than g5(n) but slower than the remaining functions.

{g3(n)} - Functions that grow faster than g4(n) but slower than the remaining functions.

{g2(n)} - Functions that grow faster than g3(n) but slower than the remaining function.

{g1(n)} - Functions with the fastest growth rate.

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