The matched differential equations with their corresponding functions are:
xy - y = x² → y = x² (C)y" + y = 0 → y = Acos(x) + Bsin(x) (where A and B are constants)(C)y" + 15y + 56y = 0 → y = [tex]Ae^(-7x) + Be^(-8x)[/tex](where A and B are constants)(B)2x²y" + 3xy = y → y = [tex]Ax^(-1) + Bx^(-2)[/tex] (where A and B are constants)(D)Given that the slope field for the equation y = -x + y is shown below and we have to sketch the solutions that pass through the points (i) (0,0); (ii) (-3,1); and (iii) (-1,0).
From the sketch, we need to find the equation of the solution to the differential equation that passes through (-1,0).The slope field for the equation y = -x + y is shown below:
As shown in the slope field, the slope of the differential equation y = -x + y can be given as:dy/dx = y - x
The solution that passes through the point (0, 0) is y = x.
The solution that passes through the point (-3, 1) is y = x - 1.
The solution that passes through the point (-1, 0) is y = x.
The equation of the solution to the differential equation that passes through (-1, 0) is y = x.
To verify that our solution is correct, we need to substitute y = x in the differential equation:
dy/dx = y - x
dy/dx = x - x
dy/dx = 0
Therefore, y = x is a solution of the differential equation.
The differential equation that matches with the given functions are:1. xy - y = x² will have a function y = x²(C)
2. y" + y = 0 will have a function y = Acos(x) + Bsin(x)(where A and B are constants)(C)
3. y" + 15y + 56y = 0 will have a function [tex]y = Ae^(-7x) + Be^(-8x)[/tex](where A and B are constants)(B)
4. 2x²y" + 3xy = y will have a function[tex]y = Ax^(-1) + Bx^(-2)[/tex](where A and B are constants)(D)
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The derivative of a function f is defined by f ′(x) = { 1 − 2 ln (2 − x 2 ) , −5 ≤ x ≤ 2 g(x), 2 < x ≤ 5 , where the graph of g is a line segment. The graph of the continuous function f ′ is shown in the figure above. Let f(3) = 4. a) Find the x-coordinate of each critical point of f and classify each as the location of a relative minimum, a relative maximum, or neither a minimum nor a maximum. Justify your answer. b) Determine the absolute maximum value of f on the closed interval –5 ≤ x ≤ 5. Justify your answer. c) Find the x-coordinates of all points of inflection of the graph of f. Justify your answer. d) Determine the average rate of change of f ′ over the interval –3 ≤ x ≤ 3. Does the mean value theorem guarantee a value of c for –3 < c < 3 such that f ′′ is equal to this average rate of change? Justify your answer.
All x in the domain of f', the mean value theorem guarantees a value of c for -3 < c < 3 such that f''(c) is equal to the average rate of change. Therefore, there exists c in (-3, 3) such that f''(c) = 0.8135.
Given that the derivative of a function f is defined by
[tex]f'(x)={1−2ln(2−x2), −5≤x≤2g(x),2 0[/tex],
for all x in the domain of f, the critical point at
x = -1.287 is the location of a relative minimum and the critical point at
x = 1.287 is the location of a relative maximum.
b) The absolute maximum value of f on the closed interval -5 ≤ x ≤ 5 is the maximum of the function f at its relative maximum, 3.946.
Therefore, the absolute maximum value of f on the closed interval -5 ≤ x ≤ 5 is 3.946.
c) To obtain the points of inflection of f, we need to find the values of x for which f''(x) = 0 or f''(x) is undefined.
[tex]f''(x) = 4(x/(2-x²))² + 2/(2-x²) = 0[/tex] givesx = 0
For the second derivative, [tex]f''(x) = 4(x/(2-x²))² + 2/(2-x²) > 0[/tex], for all x in the domain of f. Thus, there are no points of inflection.
d) The average rate of change of f' over the interval -3 ≤ x ≤ 3 is given by
[tex](f'(3) - f'(-3))/(3 - (-3)) = (0 - (-4.881)) / 6 = 0.8135Since f''(x) = 4(x/(2-x²))² + 2/(2-x²) > 0[/tex], for all x in the domain of f', the mean value theorem guarantees a value of c for -3 < c < 3 such that f''(c) is equal to the average rate of change.
Therefore, there exists c in (-3, 3) such that f''(c) = 0.8135.
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we would associate the term inferential statistics with which task?
Inferential statistics involves using sample data to make inferences, predictions, or generalizations about a larger population, providing valuable insights and conclusions based on statistical analysis.
The term "inferential statistics" is associated with the task of making inferences or drawing conclusions about a population based on sample data.
In other words, it involves using sample data to make generalizations or predictions about a larger population.
Inferential statistics is concerned with analyzing and interpreting data in a way that allows us to make inferences about the population from which the data is collected.
It goes beyond simply describing the sample and aims to make broader statements or predictions about the population as a whole.
This branch of statistics utilizes various techniques and methodologies to draw conclusions from the sample data, such as hypothesis testing, confidence intervals, and regression analysis.
These techniques involve making assumptions about the underlying population and using statistical tools to estimate parameters, test hypotheses, or predict outcomes.
The goal of inferential statistics is to provide insights into the larger population based on a representative sample.
It allows researchers and analysts to generalize their findings beyond the specific sample and make informed decisions or predictions about the population as a whole.
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To make egg ramen you need 3 eggs and 2 noodles, while to make seaweed ramen you will need 2 eggs and 3 noodles. You have a stock of 40 eggs and 35 noodles, how many of each ramen you can make?
You can make 10 egg ramen and 7 seaweed ramen with available ingredient.
How many ramen bowls can be made with the available ingredient?To determine the number of each ramen bowl that can be made, we need to consider the ingredient requirements for each type of ramen and the available stock of eggs and noodles. For egg ramen, you need 3 eggs and 2 noodles per bowl. Since you have 40 eggs and 35 noodles, the number of egg ramen bowls can be calculated by dividing the available eggs by 3 and the available noodles by 2.
This results in a maximum of 13.33 (40/3) egg ramen bowls, but since we can't have a fraction of a bowl, the maximum number of egg ramen bowls that can be made is 10 (as you can only use whole eggs).
Similarly, for seaweed ramen, you need 2 eggs and 3 noodles per bowl. With the available stock, you can make a maximum of 17.5 (35/2) seaweed ramen bowls, but again, you can only use whole eggs and noodles. Thus, the maximum number of seaweed ramen bowls that can be made is 7. Therefore, you can make 10 egg ramen and 7 seaweed ramen with the given stock of 40 eggs and 35 noodles.
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(2x³ + 6x²-7x -4)-(2x² + 9x - 3)
Answer:
2x³ + 4x² - 16x - 1
Step-by-step explanation:
this is the simplified answer. I hope this is what you were asking for.
Please give brainliest!
Find a linearization L(x, y, z) of f(x, y, z) = x²y + 4z at (1, −1, 2).
The linearization of the function f(x, y, z) = x²y + 4z at the point (1, -1, 2) is L(x, y, z) = -1 - 2(x - 1) + y + 4(z - 2). This linearization provides an approximation of the function's behavior near the given point by considering only the first-order terms in the Taylor series expansion.
To find the linearization, we need to compute the partial derivatives of f with respect to each variable and evaluate them at the given point. The linearization is an approximation of the function near the specified point that takes into account the first-order behavior.
First, let's compute the partial derivatives of f(x, y, z) with respect to x, y, and z:
∂f/∂x = 2xy,
∂f/∂y = x²,
∂f/∂z = 4.
Next, we evaluate these derivatives at the point (1, -1, 2):
∂f/∂x = 2(-1)(1) = -2,
∂f/∂y = (1)² = 1,
∂f/∂z = 4.
Using these derivative values, we can construct the linearization L(x, y, z) as follows:
L(x, y, z) = f(1, -1, 2) + ∂f/∂x(x - 1) + ∂f/∂y(y + 1) + ∂f/∂z(z - 2).
Substituting the computed values, we have:
L(x, y, z) = (1²)(-1) + (-2)(x - 1) + (1)(y + 1) + (4)(z - 2).
Simplifying this expression yields the linearization L(x, y, z) = -1 - 2(x - 1) + y + 4(z - 2).
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19. In each part, let TA: R2 → R2 be multiplication by A, and let u = (1, 2) and u2 = (-1,1). Determine whether the set {TA(u), TA(uz)} spans R2. 1 1 (a) A = -[ (b) A = --[- :) 0 2 2 -2
Given that TA: R2 → R2 be multiplication by A, and u = (1, 2) and u2 = (-1,1). Determine whether the set
[tex]{TA(u), TA(uz)}[/tex] spans R2. (a) [tex]A = -[ 1 1 ; 0 2 ]TA(u)[/tex]
[tex]= A u[/tex]
[tex]= -[ 1 1 ; 0 2 ] [1 ; 2][/tex]
[tex]= [ -1 ; 4 ]TA(u2)[/tex]
[tex]= A u2[/tex]
[tex]= -[ 1 1 ; 0 2 ] [-1 ; 1][/tex]
[tex]= [ -2 ; -2 ][/tex]
The set [tex]{TA(u), TA(uz)} = {[ -1 ; 4 ], [ -2 ; -2 ]}[/tex]
Since rank(A) = 2, [tex]rank({TA(u), TA(uz)}) ≤ 2.[/tex]
Also, the dimensions of R2 is 2. Therefore, the set [tex]{TA(u), TA(uz)}[/tex] spans R2. So, the correct option is (a).
Note: If rank(A) < 2, the span of [tex]{TA(u), TA(uz)}[/tex] is contained in a subspace of dimension at most one. If rank(A) = 0, then {TA(u),
[tex]TA(uz)} = {0}.[/tex] If rank(A) = 1, then span[tex]({TA(u), TA(uz)})[/tex] has dimension at most 1.
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9.62 According to a new bulletin released by the health department, liquor consumption among adoles- cents of a certain town has increased in recent years. f Someone comments: "it is due to the lack of providing awareness on the ill effects of liquor consumption to students from educational institutions". How large a sample is needed to estimate that the percentage of citizens who support this statement are at least 95% confident that their estimate is within 1% of the true percentage?
The sample size of approximately 9604 is needed to estimate the percentage of citizens who support the statement with at least 95% confidence and a margin of error of 1%.
To determine the sample size needed for estimating the percentage of citizens who support the statement with a certain level of confidence and margin of error, we can use the formula for sample size in estimating proportions.
The formula for sample size to estimate a population proportion is given by:
n = (Z^2 * p * (1 - p)) / E^2
Where:
n = sample size
Z = Z-score corresponding to the desired level of confidence (in this case, for 95% confidence level, Z ≈ 1.96)
p = estimated proportion (0.5 can be used as a conservative estimate when the true proportion is unknown)
E = desired margin of error (in this case, 0.01)
Plugging in the values into the formula:
n = (1.96^2 * 0.5 * (1 - 0.5)) / 0.01^2
n = (3.8416 * 0.5 * 0.5) / 0.0001
n = 0.9604 / 0.0001
n ≈ 9604
Therefore, a sample size of approximately 9604 is needed to estimate the percentage of citizens who support the statement with at least 95% confidence and a margin of error of 1%.
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State whether the given p-series converges.
155. M8 CO ---- 5 4
157. Σ H=\" T
The given series Σ M₈CO converges. A p-series is a series of the form Σ 1/nᵖ, where p is a positive constant. In this case, the series Σ M₈CO can be written as Σ 1/n⁵⁄₄. Since the exponent p is greater than 1, the series is a p-series.
For a p-series to converge, the exponent p must be greater than 1. In this case, the exponent 5/4 is greater than 1. Therefore, the series Σ M₈CO converges.
The given series Σ H="T does not converge.
In order to determine if the series converges, we need to examine the terms and look for a pattern. However, the given series Σ H="T does not provide any specific terms or a clear pattern. Without additional information, it is not possible to determine if the series converges or not.
It is important to note that convergence of a series depends on the specific terms involved and the underlying pattern. Without more information, we cannot definitively determine the convergence of Σ H="T.
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Complete Question:
State Whether The Given P-Series Converges. 155. M8 CO ---- 5 4 157. Σ H=\" T
Please show all work and keep your handwriting clean, thank you.
State whether the given p-series converges.
155.
M8
CO
----
5
4
157.
Σ
H=\
T
An auditorium has 20 rows of seats. The first row contains 40 seats. As you move to the rear of the auditorium, each row has 3 more seats than the previous row. How many seats are in the row 13? How many seats are in the auditorium? The partial sum -2+(-8) + (-32)++(-8192) equals Question Hala 744 = Find the infinite sum of the geometric sequence with a = 2, r S[infinity] = 3 7 if it exists.
The number of seats in row 13 is 52, and the total number of seats in the auditorium is 840.
How many seats are in the 13th row?The auditorium has 20 rows of seats, with the first row containing 40 seats. Each subsequent row has 3 more seats than the previous row.
To find the number of seats in row 13, we can use the arithmetic sequence formula: aₙ = a₁ + (n - 1)d, where aₙ represents the term in question, a₁ is the first term, n is the term number, and d is a common difference.
Plugging in the given values, we have a₁ = 40, n = 13, and d = 3.
Thus, a₁₃ = 40 + (13 - 1) * 3 = 52. Therefore, there are 52 seats in row 13.
To calculate the total number of seats in the auditorium, we can use the formula for the sum of an arithmetic series: Sₙ = [tex]\frac{n}{2}[/tex]* (a₁ + aₙ), where Sₙ represents the sum of the first n terms.
Plugging in the given values, we have a₁ = 40, aₙ = 52, and n = 20. Substituting these values, we get S₂₀ = [tex]\frac{20}{2}[/tex] * (40 + 52) = 840. Hence, there are 840 seats in the auditorium.
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Ivan Pedroso is a long jump athlete who wishes to qualify for the upcoming Summer Olympics. The olympic qualifying standard is 8.22 m in men's long jump, so a jump is considered as successful if it is equal to 8.22 m or more. Suppose that at each jump, Pedroso has a 0.05 chance of jumping successfully. Assume that all jumps are independent. For j = 1,2,3,...Let X; be the random variable that equals 1 if Pedroso jumps successfully at jth jump, and equals 0 otherwise. Let Y be the trial number where Pedroso jumps successfully for the first time, and let Z be the total number of successful jumps out of the first 250 trials. Which of the following is true?
Select one or more:
a. Y has a binomial distribution
b. E(Z) = 20
c. P(Y=5) = (25) (0.05)5 (0.95) 20
d. X3 has a Bernoulli distribution
e. E(Z) = 250E(X₁)
f. Z has a geometric distribution
g. E(Y) = 20
h. E(X5) = 0.25
i. X₁ has a geometric distribution
a. Y has a geometric distribution and f. Z has a geometric distribution are true. Similarly, Z represents the total number of successful jumps out of the first 250 trials. Y and Z are true
In a geometric distribution, the random variable represents the number of trials needed until the first success occurs. In this case, Y represents the trial number where Pedroso jumps successfully for the first time, so Y follows a geometric distribution. Each jump has a 0.05 probability of success, and the trials are independent.
Similarly, Z represents the total number of successful jumps out of the first 250 trials. Since each jump has a 0.05 probability of success and the trials are independent, Z also follows a geometric distribution.
The other statements are not true:
b. E(Z) = 20 is not true because the expected value of a geometric distribution is given by 1/p, where p is the probability of success. In this case, p = 0.05, so E(Z) = 1/0.05 = 20.
c. P(Y=5) = (25) (0.05)5 (0.95) 20 is not true. The probability mass function of a geometric distribution is given by [tex]P(Y = k) = (1-p)^{(k-1)} * p[/tex], where p is the probability of success and k is the trial number. So, the correct expression would be[tex]P(Y=5) = (0.95)^{(5-1)} * 0.05[/tex].
d. X3 does not have a Bernoulli distribution. X is a Bernoulli random variable because it only takes two possible values, 0 or 1, representing failure or success, respectively. However, X3 is not a random variable itself but rather the outcome of the third trial.
e. E(Z) = 250E(X₁) is not true. While Z and X₁ are related, they represent different things. E(Z) is the expected number of successful jumps out of the first 250 trials, whereas E(X₁) is the expected value of the first jump, which is 0.05.
g. E(Y) = 20 is not true. The expected value of a geometric distribution is given by 1/p, where p is the probability of success. In this case, p = 0.05, so E(Y) = 1/0.05 = 20.
h. E(X5) = 0.25 is not true. X5 represents the outcome of the fifth trial, and it has a 0.05 probability of success, so E(X5) = 0.05.
i. X₁ does not have a geometric distribution. X₁ is a Bernoulli random variable representing the success or failure of the first jump, and it follows a Bernoulli distribution with a probability of success of 0.05.
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The force of interest & is a function of time and, at any time t (measured in years), is given by the formula: 0.05, 0 ≤ t < 1, 1 St = 1≤ t < 4, 10(1+t), 0.02, 4 ≤t. (a) Using the given & directly, calculate the 4-year spot rate per annum from time t = 0 to time t = 4. [3 marks] (b) Using the given & directly, calculate the 2-year forward rate per annum from time t 2 to time t = 4 [2 marks] (c) Using the answers to parts (a) and (b), calculate the 2-year spot rate per annum from time t = 0 to time t = 2. [2 marks] (d) Calculate the present value of a 2-year deferred annuity with a term of 4 years after the deferred period, which provides continuous payments at rates of $100(t²-1)0.1 per annum for the first 2 years and $1,000 per annum for the last 2 years. [5 marks] [Total: 12 marks]
The problem involves calculating spot rates, forward rates, and present value of an annuity based on a given force of interest function. The force of interest function is provided for different time intervals. We need to calculate the 4-year spot rate per annum, the 2-year forward rate per annum, and the present value of a 2-year deferred annuity with a term of 4 years.
(a) To calculate the 4-year spot rate per annum, we need to determine the accumulated value of $1 over a 4-year period. We can use the given force of interest function to calculate this by compounding the interest rates for each time interval. We can use the formula:
Spot rate = [tex](1 + &)^n - 1[/tex]
(b) The 2-year forward rate per annum from time t=2 to t=4 can be calculated by taking the ratio of the 2-year spot rate to the 4-year spot rate. We can use the formula:
Forward rate = (1 + Spot rate2)^2 / (1 + Spot rate4)^4 - 1
(c) To calculate the 2-year spot rate per annum from time t=0 to t=2, we can use the forward rate calculated in part (b) and the 4-year spot rate calculated in part (a). We can use the formula:
Spot rate2 = (1 + Forward rate)^2 * (1 + Spot rate4)^4 - 1
(d) To calculate the present value of the annuity, we need to discount the cash flows using the spot rates. We can calculate the present value of each cash flow using the appropriate spot rate for the corresponding time period and sum them up.
By following these calculations based on the given force of interest function and formulas, we can determine the 4-year spot rate per annum, the 2-year forward rate per annum, and the present value of the deferred annuity.
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Suppose that ||v⃗ ||=1 and ||w⃗ ||=15.
Suppose also that, when drawn starting at the same point, v⃗ v→
and w⃗ w→ make an angle of 3pi/4 radians.
(A.) Find ||w⃗ +v⃗ ||||w→+v→|| and
The magnitude of the vector sum w⃗ + v⃗ is √226.3.
What is the magnitude of the vector sum w⃗ + v⃗?When two vectors v⃗ and w⃗ are drawn from the same starting point, the vector sum w⃗ + v⃗ represents the resultant vector. In this case, the magnitude of v⃗ is 1 and the magnitude of w⃗ is 15. The angle between the vectors is 3π/4 radians.
To find the magnitude of w⃗ + v⃗, we can use the Law of Cosines. The formula is:
||w⃗ + v⃗ ||² = ||v⃗ ||² + ||w⃗ ||² - 2 ||v⃗ || ||w⃗ || cos(θ)
Substituting the given values:
||w⃗ + v⃗ ||² = 1² + 15² - 2(1)(15) cos(3π/4)
Simplifying:
||w⃗ + v⃗ ||² = 1 + 225 - 30cos(3π/4)
||w⃗ + v⃗ ||² = 226 - 30(√2)/2
Taking the square root:
||w⃗ + v⃗ || ≈ √226.3
Therefore, the magnitude of the vector sum w⃗ + v⃗ is approximately √226.3.
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Partial Derivatives Now the functions are multivariable: they depend on the values of more than one variable. Take the derivative of each of the following functions with respect to x, leaving the value of y constant. Then take the derivative of each of the functions with respect to y, leaving the value of x constant. 1. f(x, y) = -4xy + 2x 2. f(x, y) = 5x²y + 3y² + 2 3. f(x,y) = \frac{2x²}{x²}. 4. f(x, y) = \frac{0,5y}{y} 5. f(x,y) = \frac{in (2x)}{y}
These are the partial derivatives of the given functions with respect to x and y.
find the partial derivatives of each of the given functions with respect to x and y, while treating the other variable as a constant:
1. f(x, y) = -4xy + 2x
Partial derivative with respect to x: ∂f/∂x = -4y + 2
Partial derivative with respect to y:
∂f/∂y = -4x
2. f(x, y) = 5x²y + 3y² + 2
Partial derivative with respect to x:
∂f/∂x = 10xy
Partial derivative with respect to y:
∂f/∂y = 5x² + 6y
3. f(x, y) = (2x²)/(x²)
Partial derivative with respect to x:
∂f/∂x = 2
Partial derivative with respect to y:
∂f/∂y = 0 (Since y is not involved in the expression)
4. f(x, y) = (0.5y)/(y)
Partial derivative with respect to x:
∂f/∂x = 0 (Since x is not involved in the expression)
Partial derivative with respect to y:
∂f/∂y = 0.5(1/y) = 0.5/y
5. f(x, y) = ln(2x)/y
Partial derivative with respect to x:
∂f/∂x = (1/(2x))/y = 1/(2xy)
Partial derivative with respect to y:
∂f/∂y = -ln(2x)/(y²)
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the van travels over the hill described by y=(−1.5(10−3)x2+15)ft
The van reaches a maximum height of 15 feet at the top of the hill, which is located at the coordinates (0, 15).
The equation y = -1.5(10^-3)x^2 + 15 represents the height of the hill as a function of the horizontal distance x traveled by the van.
To find the maximum height of the hill, we need to determine the vertex of the parabolic curve described by the equation. The vertex of a parabola in the form y = ax^2 + bx + c is given by the coordinates (-b/2a, f(-b/2a)), where f(x) represents the function.
In this case, a = -1.5(10^-3), b = 0, and c = 15.
To find the vertex, we can use the formula: x = -b/2a = -0/2(-1.5(10^-3)) = 0.
Substituting x = 0 into the equation y = -1.5(10^-3)x^2 + 15, we find y = -1.5(10^-3)(0)^2 + 15 = 15.
Therefore, the van reaches a maximum height of 15 feet at the top of the hill, which is located at the coordinates (0, 15).
Your question is incomplete but most probably your full question was
the van travels over the hill described by y=(−1.5(10−3)x2+15)ft, find it's maximum height
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Find the infinite sum, if it exists for this series: - 3+ (0.75) + (− 0.1875) +…...
The given series is: 3+ (0.75) + (− 0.1875) +…..., we are to find the infinite sum, if it exists for this series.The given series is a GP(Geometric progression) with a = 3 and r = -0.25.
As we know the sum of an infinite geometric progression (GP) is given as:`S = a / (1 - r)`where,a = 3,r = -0.25We know that a series will only converge if the common ratio, r is less than one and greater than negative one, so in our case the common ratio, r is -0.25 which is greater than negative one and less than one, thus it will converge.Now, substituting the values of a and r in the formula:`S = a / (1 - r)` `= 3 / (1 + 0.25)` `= 12 / 5`Thus, the infinite sum exists for this series, and it is 12/5.
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Probability density function of random variable X is defined by
the following expression:
(x)={cx+1,0≤x≤2 or 0,oℎ.
Find []
The value of c in the given probability density function (pdf) is -1.
To find the value of the constant c, we need to satisfy the condition that the probability density function (PDF) integrates to 1 over its entire range.
The integral of the PDF over the range 0 ≤ x ≤ 2:
∫[0,2] (cx + 1) dx
Integrating with respect to x:
∫[0,2] cx dx + ∫[0,2] dx
Applying the power rule of integration:
(c/2) ×x² evaluated from 0 to 2 + x evaluated from 0 to 2
[(c/2) ×(2²) - (c/2)×(0²)] + (2 - 0)
Simplifying:
(2c/2) + 2
c + 2
To make the PDF integrate to 1, we need this expression to equal 1:
c + 2 = 1
Solving for c:
c = 1 - 2
c = -1
Therefore, the value of the constant c is -1.
The probability density function (PDF) of the random variable X is given by:
f(x) = -x - 1, 0 ≤ x ≤ 2
f(x) = 0, otherwise
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Find the Laplace transform of 3.1.1. L{3+2t4t³} 3.1.2. L{cosh²3t} 3.1.3. L{3t²e-2t} [39] [5] [4] [5]
The Laplace transform of [tex]3 + 2t^4t^3[/tex] is [tex]3/s + 48/s^9[/tex], the Laplace transform of cosh²(3t) is [tex](1/2) * (s / (s^2 - 36) + 1/s)[/tex] and the Laplace transform of [tex]3t^2e^{-2t}[/tex] is [tex]6 / (s + 2)^3.[/tex]
The Laplace transforms of the given functions.
3.1.1. [tex]L{3 + 2t^4t^3}[/tex]
To find the Laplace transform of this function, we'll break it down into two separate terms and apply the linearity property of the Laplace transform.
[tex]L{3 + 2t^4t^3} = L{3} + L{2t^4t^3}[/tex]
The Laplace transform of a constant is simply the constant divided by 's':
[tex]L{3} = 3/s[/tex]
Now let's find the Laplace transform of the term [tex]2t^4t^3[/tex]:
[tex]L{2t^4t^3} = 2 * L{t^4} * L{t^3}[/tex]
The Laplace transform of tn (where n is a positive integer) is given by:
[tex]L{(t_n)} = n! / s^{(n+1)[/tex]
Therefore,
[tex]L{2t^4t^3} = 2 * (4!) / s^5 * (3!) / s^4[/tex]
Simplifying further,
[tex]L{2t^4t^3} = 48 / s^9[/tex]
Combining the terms, we have:
[tex]L{3 + 2t^4t^3} = 3/s + 48/s^9[/tex]
So, the Laplace transform of [tex]3 + 2t^4t^3[/tex] is [tex]3/s + 48/s^9[/tex].
3.1.2. L{cosh²(3t)}
To find the Laplace transform of this function, we can use the identity:
L{cosh(at)} = [tex]s / (s^2 - a^2)[/tex]
Using this identity, we can rewrite cosh²(3t) as (1/2) * (cosh(6t) + 1):
L{cosh²(3t)} = (1/2) * (L{cosh(6t)} + L{1})
L{1} represents the Laplace transform of the constant function 1, which is simply 1/s.
Now, let's find the Laplace transform of cosh(6t):
L{cosh(6t)} = [tex]s / (s^2 - 6^2)[/tex]
L{cosh(6t)} = [tex]s / (s^2 - 36)[/tex]
Putting it all together,
L{cosh²(3t)} = [tex](1/2) * (s / (s^2 - 36) + 1/s)[/tex]
So, the Laplace transform of cosh²(3t) is [tex](1/2) * (s / (s^2 - 36) + 1/s).[/tex]
3.1.3. L{[tex]3t^2e^{-2t}[/tex]}
To find the Laplace transform of this function, we'll apply the Laplace transform property for the product of a constant, a power of 't', and an exponential function.
The Laplace transform property is given as follows:
L{[tex]t^n * e^{(at)}[/tex]} = [tex]n! / (s - a)^{(n+1)[/tex]
In this case, n = 2, a = -2, and the constant multiplier is 3:
L{[tex]3t^2e^{-2t}[/tex]} =[tex]3 * L[{t^2* e^{-2t}}][/tex]
Using the Laplace transform property, we have:
L{[tex]t^2 * e^{-2t}[/tex]} = [tex]2! / (s + 2)^3[/tex]
Simplifying further,
L[t² * [tex]e^{-2t} ]= 2 / (s + 2)^3[/tex]
Now, combining the terms, we get:
L{[tex]3t^2e^{-2t}[/tex]} =[tex]3 * 2 / (s + 2)^3[/tex]
L{[tex]3t^2e^{-2t}[/tex]} = 6 / (s + 2)^3
Therefore, the Laplace transform of [tex]3t^2e^{-2t}[/tex] is [tex]6 / (s + 2)^3.[/tex]
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What does the coefficient of variation measure? Select one: Oa. The size of variation Ob. The range of variation Oc. The scatter of in the data relative to the mean
The coefficient of variation measures the scatter of in the data relative to the mean. The correct option is C
What is coefficient of variation ?
The coefficient of variation is a statistical measure that expresses the relative variability of a dataset.
The coefficient of variation calculates how widely distributed the data are in relation to the mean. The formula for calculating it is to divide the standard deviation by the mean. More variance in the data is indicated by a greater coefficient of variation, and less variation is indicated by a lower coefficient of variation.
The standard deviation calculates the degree of variation. The difference between the highest and lowest values in the data set is used to calculate the range of variation.
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Compute partial derivatives of functions of more than one variable. Let f(x, y) = 3x² + 2y = 7xy, find the partial derivative f_x
To find the partial derivative of f(x, y) with respect to x, denoted as f_x, we differentiate the function f(x, y) with respect to x while treating y as a constant. In this case, f(x, y) = 3x² + 2y - 7xy.
To calculate f_x, we differentiate each term with respect to x. The derivative of 3x² with respect to x is 6x, the derivative of 2y with respect to x is 0 (as y is treated as a constant), and the derivative of 7xy with respect to x is 7y. Summing up the partial derivatives, we have f_x = 6x + 0 - 7y = 6x - 7y. Therefore, the partial derivative of f(x, y) with respect to x, f_x, is given by 6x - 7y.
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Evaluate the triple integral ∫∫∫E xydV where E is the solid tetrahedon with vertices (0, 0, 0), (1, 0, 0), (0, 3,0), (0, 0,6).
The value of the triple integral ∫∫∫E xy dV is 54.
To evaluate the triple integral ∫∫∫E xy dV, we first need to determine the limits of integration for each variable.
The solid tetrahedron E is defined by the vertices (0, 0, 0), (1, 0, 0), (0, 3, 0), and (0, 0, 6).
For the x-variable, the limits of integration are determined by the base of the tetrahedron in the xy-plane. The base is a right triangle with vertices (0, 0), (1, 0), and (0, 3). Therefore, the limits for x are from 0 to 1.
For the y-variable, the limits of integration are determined by the height of the tetrahedron along the y-axis. The height of the tetrahedron is from 0 to 6. Therefore, the limits for y are from 0 to 6.
For the z-variable, the limits of integration are determined by the height of the tetrahedron along the z-axis. The height of the tetrahedron is from 0 to 6. Therefore, the limits for z are from 0 to 6.
The triple integral ∫∫∫E xy dV becomes:
∫∫∫E xy dV = ∫[0,6] ∫[0,6] ∫[0,1] xy dx dy dz
Integrating with respect to x first, the innermost integral becomes:
∫[0,1] xy dx = (1/2)x²y |[0,1] = (1/2)(1)²y - (1/2)(0)²y = (1/2)y
Next, integrating with respect to y:
∫[0,6] (1/2)y dy = (1/4)y² |[0,6] = (1/4)(6)² - (1/4)(0)² = 9
Finally, integrating with respect to z:
∫[0,6] 9 dz = 9z |[0,6] = 9(6) - 9(0) = 54
Therefore, the value of the triple integral ∫∫∫E xy dV is 54.
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A company manufactures and sells x television sets per month. The monthly cost and price-demand equations areC(x)=72,000+60x and p(x)=300−(x/20),
0l≤x≤6000.
(A) Find the maximum revenue.
(B) Find the maximum profit, the production level that will realize the maximum profit, and the price the company should charge for each television set.
(C) If the government decides to tax the company $55 for each set it produces, how many sets should the company manufacture each month to maximize its profit? What is the maximum profit? What should the company charge for each set?
(A) The maximum revenue is $
(Type an integer or a decimal.)
(B) The maximum profit is when sets are manufactured and sold for each.
(Type integers or decimals.)
(C) When each set is taxed at $55, the maximum profit is when sets are manufactured and sold for each.
(Type integers or decimals.)
To find the maximum revenue, we need to multiply the quantity of television sets sold (x) by the selling price per set (p(x)). The revenue function is given by R(x) = x * p(x).
Substituting the given price-demand equation p(x) = 300 - (x/20), we have R(x) = x * (300 - (x/20)). To find the maximum revenue, we can maximize this function by finding the value of x that gives the maximum.
To find the maximum profit, we need to subtract the cost function (C(x)) from the revenue function (R(x)). The profit function is given by P(x) = R(x) - C(x). Using the revenue function and the cost function given as C(x) = 72,000 + 60x, we have P(x) = x * (300 - (x/20)) - (72,000 + 60x). To find the maximum profit, we can maximize this function by finding the value of x that gives the maximum.
To determine the production level that will realize the maximum profit, we look for the value of x that maximizes the profit function P(x). The price the company should charge for each television set can be determined by substituting this value of x into the price-demand equation p(x) = 300 - (x/20).
If each set is taxed at $55, we need to modify the profit function to account for this tax. The new profit function becomes P(x) = x * (300 - (x/20) - 55) - (72,000 + 60x). To maximize the profit under this tax, we find the value of x that gives the maximum. The number of sets the company should manufacture each month to maximize its profit is determined by this value of x. The maximum profit can be obtained by evaluating the profit function at this value of x. The price the company should charge for each set is determined by substituting this value of x into the price-demand equation p(x) = 300 - (x/20).
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Tickets for a recent concert cost $20 for adults and 512 for kids. Total attendance for the concert was 840 and total ticket sales were $12.496. How many of each ticket type were sold? a. 2,912 adult tickets, -2,072 kid's tickets b. 212 adult tickets, 628 kid's tickets c. 302 adult tickets, 538 kid's tickets
d. 53 adult tickets, 787 kid's tickets
The solution is:
Number of adult tickets sold: 53
Number of kid's tickets sold: 787
To solve the problem, let's denote the number of adult tickets sold as A and the number of kid's tickets sold as K. We can then set up a system of equations based on the given information:
Equation 1: A + K = 840 (Total attendance)
Equation 2: 20A + 512K = 12,496 (Total ticket sales)
To find the solution, we can solve this system of equations using the method of substitution or elimination.
Let's go through the options provided:
a. 2,912 adult tickets, -2,072 kid's tickets:
Plugging the values into Equation 1: 2,912 + (-2,072) = 840, which is not true. The total attendance should be a positive number.
b. 212 adult tickets, 628 kid's tickets:
Plugging the values into Equation 1: 212 + 628 = 840, which is true.
Plugging the values into Equation 2: 20(212) + 512(628) = 12,496, which is true.
c. 302 adult tickets, 538 kid's tickets:
Plugging the values into Equation 1: 302 + 538 = 840, which is true.
Plugging the values into Equation 2: 20(302) + 512(538) = 12,496, which is true.
d. 53 adult tickets, 787 kid's tickets:
Plugging the values into Equation 1: 53 + 787 = 840, which is true.
Plugging the values into Equation 2: 20(53) + 512(787) = 12,496, which is true.
From the options provided, both options b and d satisfy both equations. However, we need to ensure that the number of tickets sold cannot be negative, so option d is the correct answer.
Therefore, the solution is:
Number of adult tickets sold: 53
Number of kid's tickets sold: 787
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Problem 3. Consider a game between 3 friends (labeled as A, B, C). The players take turns (i.e., A→ B→C → A→B→C...) to flip a coin, which has probability p = (0, 1) to show head. If the outcome is tail, the player has to place 1 bitcoin to the pool (which initially has zero bitcoin). The game stops when someone tosses a head. He/she, which is the winner of this game, will then earn all the bitcoin in the pool. (a) Who (A, B, C) has the highest chance to win the game? What is the winning prob- ability? Does the answer depend on p? What happens if p → 0? (b) Let Y be the amount of bitcoins in the pool in the last round (of which the winner will earn all). Find E[Y] and Var(Y). (c) Let Z be the net gain of Player A of this game (that is, the difference of the bitcoins he earns in this game (0 if he doesn't win), and the total bitcoins he placed in the previous rounds). Find E[Z]. (d) † Repeat (b), (c) if the rule of placing bets is replaced by "the player has to place k bitcoins to the pool at k-th round
The net gain of Player A is given by Z = {Y if A wins 0 otherwise Therefore, E[Z] = E[Y] Pr(A wins)
(a) The probability of the coin to come up heads is p = (0, 1). Since it's a fair coin, the probability of coming up tails is (1 - p) = (1 - 0) = 1.
Therefore, the probability of the game ending is 1.
If the outcome is tail, the player must put 1 bitcoin into the pool (which begins at 0 bitcoin).
When someone flips a head, he/she earns all of the bitcoins in the pool, and the game concludes. The players alternate turns (A->B->C->A->B->C, etc.).
So, Player C has the best chance of winning the game. The winning probability is (1-p)/(3-p), which does not depend on p and equals 1/3 when p = 0. (b)
Let Y be the amount of bitcoins in the pool in the last round (of which the winner will earn all). Find E[Y] and Var(Y).
The probability of the game ending after round k is p(k - 1)(1 - p)3.
Therefore, E[Y] = 3∑k = 1∞p(k - 1)(1 - p)k-1 and Var(Y) = 3∑k = 1∞k2p(k - 1)(1 - p)k-1 - [3∑k = 1∞kp(k - 1)(1 - p)k-1]2
(c) Let Z be the net gain of Player A of this game (that is, the difference of the bitcoins he earns in this game (0 if he doesn't win), and the total bitcoins he placed in the previous rounds). Find E[Z].
Player A's net gain is given by Z = {Y if A wins 0 otherwise Therefore, E[Z] = E[Y] Pr(A wins)
The probability that A wins is (1/2 + 1/2(1-p) + 1/2(1-p)2 + ...) = 1/(2-p) Therefore, E[Z] = E[Y]/(2-p)(d)†
Repeat (b), (c) if the rule of placing bets is replaced by "the player has to place k bitcoins to the pool at k-th round.
If the player has to place k bitcoins into the pool at the k-th round, the probability of the game ending after round k is p(k - 1)(1 - p)3, and the pool will have (k - 1) bitcoins.
Therefore, E[Y] = ∑k = 1∞k(1 - p)k-1p(k - 1)k(k + 1)/2 and Var(Y) = ∑k = 1∞k2(1 - p)k-1p(k - 1)k(k + 1)/2 - [∑k = 1∞k(1 - p)k-1p(k - 1)k(k + 1)/2]2
The probability that A wins is given by 1/p, which yields E[Z] = E[Y]/p.
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The distribution of scores on an accounting test is T(45, 72, 106). (a) Find the mean. (Round your answer to 2 decimal places.) (b) Find the standard deviation. (Round your answer to 2 decimal places.) (c) Find the probability that a score will be less than 67. (Round your answer to 4 decimal places.)
To solve the given problems related to the T-distribution with parameters T(45, 72, 106), we need to find the mean, standard deviation, and probability using the T-distribution table or a calculator.
(a) The mean of the T-distribution is equal to the location parameter, which is given as 72. Therefore, the mean is 72.
(b) The standard deviation of the T-distribution is calculated using the scale parameter. In this case, the scale parameter is 106. Thus, the standard deviation is 106.
(c) To find the probability that a score will be less than 67, we need to use the T-distribution table or a calculator. By looking up the degrees of freedom (df = 45) and the corresponding T-value for 67, we can determine the probability. Let's assume the probability is denoted as P(T < 67). The calculated probability, rounded to 4 decimal places, will represent the likelihood of a score being less than 67.
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Find a particular solution to the following differential equation using the method of variation of parameters. x²y" - 3xy² + 3y = x² ln x
To find a particular solution to the differential equation using the method of variation of parameters, we'll follow these steps.
1. Find the complementary solution:
Solve the homogeneous equation x^2y" - 3xy^2 + 3y = 0. This is a Bernoulli equation, and we can make a substitution to transform it into a linear equation.
Let v = y^(1 - 2). Differentiating both sides with respect to x, we have:
v' = (1 - 2)y' / x - 2y / x^2
Substituting y' = (v'x + 2y) / (1 - 2x) into the differential equation, we get:
x^2((v'x + 2y) / (1 - 2x))' - 3x((v'x + 2y) / (1 - 2x))^2 + 3((v'x + 2y) / (1 - 2x)) = 0
Simplifying, we have:
x^2v'' - 3xv' + 3v = 0
This is a linear homogeneous equation with constant coefficients. We can solve it by assuming a solution of the form v = x^r. Substituting this into the equation, we get the characteristic equation:
r(r - 1) - 3r + 3 = 0
r^2 - 4r + 3 = 0
(r - 1)(r - 3) = 0
The roots of the characteristic equation are r = 1 and r = 3. Therefore, the complementary solution is:
y_c(x) = C1x + C2x^3, where C1 and C2 are constants.
2. Find the particular solution:
We assume the particular solution has the form y_p(x) = u1(x)y1(x) + u2(x)y2(x), where y1 and y2 are solutions of the homogeneous equation, and u1 and u2 are functions to be determined.
In this case, y1(x) = x and y2(x) = x^3. We need to find u1(x) and u2(x) to determine the particular solution.
We use the formulas:
u1(x) = -∫(y2(x)f(x)) / (W(y1, y2)(x)) dx
u2(x) = ∫(y1(x)f(x)) / (W(y1, y2)(x)) dx
where f(x) = x^2 ln(x) and W(y1, y2)(x) is the Wronskian of y1 and y2.
Calculating the Wronskian:
W(y1, y2)(x) = |y1 y2' - y1' y2|
= |x(x^3)' - (x^3)(x)'|
= |4x^3 - 3x^3|
= |x^3|
Calculating u1(x):
u1(x) = -∫(x^3 * x^2 ln(x)) / (|x^3|) dx
= -∫(x^5 ln(x)) / (|x^3|) dx
This integral can be evaluated using integration by parts, with u = ln(x) and dv = x^5 / |x^3| dx:
u1(x) = -ln(x) * (x^2 /
2) - ∫((x^2 / 2) * (-5x^4) / (|x^3|)) dx
= -ln(x) * (x^2 / 2) + 5/2 ∫(x^2) dx
= -ln(x) * (x^2 / 2) + 5/2 * (x^3 / 3) + C
Calculating u2(x):
u2(x) = ∫(x * x^2 ln(x)) / (|x^3|) dx
= ∫(x^3 ln(x)) / (|x^3|) dx
This integral can be evaluated using substitution, with u = ln(x) and du = dx / x:
u2(x) = ∫(u^3) du
= u^4 / 4 + C
= (ln(x))^4 / 4 + C
Therefore, the particular solution is:
y_p(x) = u1(x)y1(x) + u2(x)y2(x)
= (-ln(x) * (x^2 / 2) + 5/2 * (x^3 / 3)) * x + ((ln(x))^4 / 4) * x^3
= -x^3 ln(x) / 2 + 5x^3 / 6 + (ln(x))^4 / 4
The general solution of the differential equation is the sum of the complementary solution and the particular solution:
y(x) = y_c(x) + y_p(x)
= C1x + C2x^3 - x^3 ln(x) / 2 + 5x^3 / 6 + (ln(x))^4 / 4
Note that the constant C1 and C2 are determined by the initial conditions or boundary conditions of the specific problem.
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Determine interior, accumulation and isolated points for the following sets (A= (-4,15]\{10} (3 marks) (ii) B = (0,1) nQ, where Q is set of rational numbers. (3 marks) I Borgeren W P e
Interior points: The point x ∈ S is known as an interior point of S if there exists a neighborhood of x that is completely contained in S. Given, A= (-4,15] \ {10} and B = (0,1) ∩ Q, where Q is a set of rational numbers.
We need to determine the interior, accumulation, and isolated points for the given sets. So, A= (-4,15] \ {10}. Here, the point is not included so, the interior point of set A is all points within the interval (-4, 10) and (10, 15]. It can also be written asInt A = (-4,10) U (10,15] Accumulation Points: Let S be a set of real numbers and x ∈ R be a limit point of S if every ε-neighborhood of x intersects S in a point other than x. So, A= (-4,15] \ {10}. Hence the limit points of A are -4, 10, and 15. Isolated points: A point x ∈ S is known as an isolated point of S if x is not a limit point of S. Here, the point x=10 ∈ A is an isolated point of A. B = (0,1) ∩ Q, where Q is a set of rational numbers Interior points: Since Q is dense in R, every point of (0,1) is an accumulation point of Q. Thus there are no interior points in B, i.e., int B = ∅. Accumulation Points: Since Q is dense in R, every point of (0,1) is an accumulation point of Q. Therefore, all points of (0,1) are the accumulation points of B. Isolated points: The isolated points of the set B are all points of (0,1) that are not rational numbers. That is, the isolated points of the set B are all irrational numbers in (0,1).
The given sets A= (-4,15] \ {10} and B = (0,1) ∩ Q, where Q is a set of rational numbers that are examined for interior points, accumulation points, and isolated points. For set A, the interior points are (-4,10) U (10,15], the limit points are -4, 10, and 15, and the isolated point is 10. For set B, there are no interior points, all points of (0,1) are accumulation points, and the isolated points are irrational numbers in (0,1).
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A sample of 20 students who have taken a statistics exam at Işık University, show a mean = 72 and variance s² = 16 at the exam grades. Assume that grades are distributed normally, find a %98 confidence interval for the variance of all student's grades.
If sample of 20 students who have taken a statistics exam at Işık University, show a mean = 72. The 98% confidence interval for the variance of all student's grades is [8.64, 31.7].
What is the confidence interval?Determine the degrees of freedom.
Degrees of freedom for estimating the variance = (n - 1)
Where:
n = sample size
n = 20
Degrees of freedom = 20 - 1
Degrees of freedom = 19
Find the critical chi-square values.
The critical values are chi-square =(0.01/2)
Chi-square(1 - 0.01/2)
From the chi-square table
Chi-square(0.005) = 9.590
Chi-square(0.995) = 35.172
Confidence interval for the variance:
[(n - 1) * s² / chi-square(α/2), (n - 1) * s² / chi-square(1 - α/2)]
Substituting the values:
Lower bound = (19 * 16) / 35.172 ≈ 8.64
Upper bound = (19 * 16) / 9.590 ≈ 31.7
Therefore the 98% confidence interval for the variance of all student's grades is [8.64, 31.7].
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An urn contains 9 white and 6 black marbles. If 14 marbles are to be drawn at random with replacement and X denotes the number of white marbles, Find E(X)
Expected value (E(X)) can be found using [tex]E(X) = \sum(x \times P(X = x))[/tex] for which [tex]P(X = x)[/tex] should be calculated which can be found using [tex]P(X = x) = (nC_x) \times p^x \times (1-p)^{(n-x)}[/tex].
The expected value (E(X)) represents the average or mean value of a random variable. In this case, the random variable X represents the number of white marbles drawn.
Since each marble is drawn with replacement, each draw is independent and has the same probability of selecting a white marble. The probability of drawing a white marble on each draw is 9/15 (9 white marbles out of a total of 15 marbles).
To calculate E(X), we can use the formula:
[tex]E(X) = \sum(x \times P(X = x))[/tex]
where x represents the possible values of X (in this case, 0 to 14), and P(X = x) represents the probability of X taking the value x.
For each possible value of X (0 to 14), we can calculate the probability P(X = x) using the binomial distribution formula:
[tex]P(X = x) = (nC_x) \times p^x \times (1-p)^{(n-x)}[/tex]
where n is the number of trials (14 in this case), p is the probability of success (9/15), and x is the number of successes (number of white marbles drawn).
By calculating the E(X) using the formula mentioned above and considering all possible values of X, we can find the expected value of the number of white marbles drawn from the urn.
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Evaluate these quantities. a) 13 mod 3 c) 155 mod 19 b) -97 mod 11 d) -221 mod 23 33. List all integers between - 100 and 100 that are congruent to -1 modulo 25. f thona intaners is congruent to
According to the question the evaluating these quantities are as follows:
a) 13 mod 3:
To evaluate 13 mod 3, we divide 13 by 3 and find the remainder:
13 ÷ 3 = 4 remainder 1
Therefore, 13 mod 3 is 1.
b) -97 mod 11:
To evaluate -97 mod 11, we divide -97 by 11 and find the remainder:
-97 ÷ 11 = -8 remainder -9
Since we want the remainder to be positive, we add 11 to the remainder:
-9 + 11 = 2
Therefore, -97 mod 11 is 2.
c) 155 mod 19:
To evaluate 155 mod 19, we divide 155 by 19 and find the remainder:
155 ÷ 19 = 8 remainder 3
Therefore, 155 mod 19 is 3.
d) -221 mod 23:
To evaluate -221 mod 23, we divide -221 by 23 and find the remainder:
-221 ÷ 23 = -9 remainder -10
Since we want the remainder to be positive, we add 23 to the remainder:
-10 + 23 = 13
Therefore, -221 mod 23 is 13.
List all integers between -100 and 100 that are congruent to -1 modulo 25:
To find the integers between -100 and 100 that are congruent to -1 modulo 25, we need to find the integers whose remainder is -1 when divided by 25.
Starting from -100, we add or subtract multiples of 25 until we reach 100:
-100, -75, -50, -25, 0, 25, 50, 75
Among these integers, the ones that are congruent to -1 modulo 25 are:
-75, 0, 25, 50, and 75.
Therefore, the integers between -100 and 100 that are congruent to -1 modulo 25 are -75, 0, 25, 50, and 75.
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HELP!!! 100 points!!!
You buy 3 magazine ads for every one newspaper ad. in total, you have 24 ads
Write an equation representing this, and explain.
Answer:
the number of social media advertisements that you purchased is 18
The number of newspaper advertisements that you purchased is 6
Step-by-step explanation:
Let x represent the number of social media advertisements that you purchased.
Let y represent the number of newspaper advertisements that you purchased.
You purchase three social media advertisements for every one newspaper advertisement. This means that y = x/3
x = 3y
You end up purchasing a total of 24 advertisements. This means that
x + y = 24 - - - - - - - - - 1
Substituting y = into equation 1, becomes
3y + y = 24
4y = 24
y = 24/4 = 6
x = 3y = 6×3 = 18
The equations are
x = 3y
x + y = 24
