Two friends, Caleb and Hassan, took summer jobs. The equation y=21.5xy=21.5x represents Hassan's earnings in dollars and cents, yy, for working xx hours. Caleb earned $819.40 in 34 hours.
Use the dropdown menu and answer-blank below to form a true statement.

It is neither row echelon form nor reduced row echelon form matrix

How do you know if a matrix is in echelon form or reduced echelon form matrix ?

A matrix is in reduced row-echelon form if it satisfies the following:

In each row, the left-most nonzero entry is 1 and the column that contains this 1 has all other entries equal to 0. ...

The leading 1 in the second row or beyond is to the right of the leading 1 in the row just above.

if you look at the two row echlon form you can see that it has leading entries(starting form left) that all one and there are no-zero elements above diagonal which can be any numbers (2,3,4, 6, x,y,x).

However reduced row echelon of has always leading elements 1 and are on diognal, this form is always like this therefore we can infer that reduced row echlon form is always uniqe as oppose to row echelon form.

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The amount of money gives to my friend today so that the repayment of $500 in 2 weeks is equivalent to a simple interest loan with a rate of 153% per year is,  $477.10

Simple interest is an amount which is calculated for a certain period of time and for a certain rate, in simple interest calculation there are three factors which we consider: principal amount(P), rate(R) and time(T).

Every time we calculate simple interest the principal values will be the same unlike compound interest.

Formula;    Simple Interest(I) =  P × R × T/100

Given that,

Loan agreed on simple interest rate =  153% per year

He knows that he can pay me back $500 in 2 weeks or 2/52 years

Suppose, money given to him = P

So, simple interest of amount P in 2 weeks

I   = P × 125 ×(2/52) /100

   = 0.048P

Total repayment = P + 0.048P

He can pay back only $500

Total repayment = $500

P + 0.048P         = $500

1.048P = 500

P       =    477.10

Hence, the loan amount is  $477.10

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Answer:

Bacteria Growth The number N of bacteria in culture is modeled by N= 250e^kt where t is the time in hours. If N = 280 when t= 10, estimate the time required for the population to double in size.

Step-by-step explanation:

(⁠◔⁠‿⁠◔⁠)(⁠◔⁠‿⁠◔⁠)(⁠◔⁠‿⁠◔⁠)

The values would be

log √7= 0.291

log 23/6= 0.585

What is a logarithm?

A logarithm is a mathematical function that calculates the power to which a given number (called the base) must be raised to produce a given value. The most common base used in logarithms is base 10, but logarithms can be defined with any base. If the base of a logarithm is not specified, it is assumed to be base 10. The logarithm of a number is represented by the symbol log.

log √7 = (1/3)log7

Log 23/6 = log(23) - log(6)

The logarithm of a number is the exponent to which the base must be raised to produce that number. If the base of the logarithm is not specified, it is assumed to be base 10.

The square root of 7 is around 2.646, and log2.646 is around 0.874, so

log √7 = (1/3)log7 = (1/3)*0.874 ≈ 0.291

The logarithm of 23 is around 1.363 and the logarithm of 6 is around 0.778, so

Log 23/6 = log(23) - log(6) = 1.363 - 0.778 = 0.585

Hence, the values would be

log √7= 0.291

log 23/6= 0.585

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1. Yes, this is a binomial distribution.

2. n = 200, p = 0.25.

3. The mean of X is 50. This means that we can expect to get 50 cherry flavored Starburst candies on average.

4. The standard deviation of X is 7.07. This means that the number of cherry flavored candies is likely to be close to the mean of 50, but it could vary by up to 7.07 in either direction.

5. The probability of getting exactly 60 cherry flavored Starburst is 0.108.

6. The probability of getting at most 60 cherry flavored Starburst is 0.619.

A bag of Starburst candies can be considered an SRS of the whole population of Starburst candies since there are 4 flavors. The probability that each Starburst is cherry flavor is 0.25. Since we are buying one bag of Starburst, the number of cherry flavored candies in the bag can be represented by a binomial distribution with n = 200 and p = 0.25. This means that the mean of X (the number of cherry flavored candies) is 50. The standard deviation of X is 7.07, which means that the number of cherry flavored candies is likely to be close to the mean of 50, but could vary by up to 7.07 in either direction. The probability of getting exactly 60 cherry flavored Starburst is 0.108, and the probability of getting at most 60 cherry flavored Starburst is 0.619.

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Answer:

Step-by-step explanation:

t%5Bc%5D=2.055

ME=SE%2At%5Bc%5D

ME=4.118%2A2.055

ME=8.463

.

.

.

(67.7,84.7)

Answer:

h = 40 cm

Step-by-step explanation:

1. Let's calculate the total volume of 1920 cubes, size 5 x 5 x 5 cm:

V one =  5 cm x 5 cm x 5 cm = 125 cm³
V all = 1920 x 125 = 240,000 cm³

2. Divide this volume by the area of the paper to get the height, given that 1 m = 100 cm:

S paper = 100 cm x 60 cm = 6,000 cm²

h = V all / S paper = 240,000 / 6,000 = 40 cm

If we mark off a distance t along the unit circle, starting at (1, 0) and moving in a counterclockwise direction, we arrive at the terminal point determined by t.

What is a terminal point?

The ray that has been rotated around the origin to form an angle with the stationary ray that is the initial side of the angle is the ray that has reached its terminal point. The most typical acute-angle measurements are represented by the sine and cosine values.

The coordinates of the terminal point come from the coordinates of the reference point (positive or negative depending on the quadrant.)

We know that a unit circle is the circle of radius 1 which is centered at the origin in the xy-plane.

General equation of a unit circle is: x^2+ y^2 = 1

Starting at the point (1,0),

If t≥0, then, t is the distance along the unit circle in clockwise direction

If t<0, then mod t is the distance along the unit circle in clockwise direction.

Here, role="math" , localid="1648202152711"t is a real number by which a point P(x,y) is generated. This point is known as the terminal point which is determined by the real number t.

Hence, if we mark off a distance t along the unit circle, starting at (1, 0) and moving in a counterclockwise direction, we arrive at the terminal point determined by t.

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Answer:

A rational equation is an equation containing at least one fraction whose numerator and denominator are polynomials, \frac{P(x)}{Q(x)}. Q(x)P(x). These fractions may be on one or both sides of the equation.

Answer: 0.002. 0.127 - 0.125 is 0.002

[tex]y=\frac{3}{2}x-4[/tex]

Linear functions can be written in different forms such as standard and slope-intercept form.

Rewriting the Equation

To rewrite standard form (Ax + By = C) into slope-intercept, simply solve for y. To solve for y, we need to isolate it. We can do this using the properties of equality. Firstly, move x to the opposite side.

Subtract 3x from both sides.

Then, divide both sides by -2.

This is the slope-intercept form.

Interpreting the Values

Slope-intercept form is written as y = mx + b, m is the slope and b is the y-intercept. This means that the slope of the line we were given is 3/2. Additionally, the y-intercept is -4.

Answer:

y = 3/2 x - 4

Step-by-step explanation:

The given equation is:

Recall that the slope-intercept form is of the form:

Therefore the equation can be rewritten as follows:

The probability that at least 20 of the novels have fewer than 400 pages is 1 - 0.2266 = 0.7734 or 77.34%.

What is the normal distribution and the cumulative distribution?

The normal distribution, also known as the Gaussian distribution or bell curve, is a probability distribution that describes the distribution of a continuous random variable.

The cumulative distribution function (CDF) is a function that gives the probability that a random variable is less than or equal to a certain value

To solve this problem, we can use the normal distribution and the cumulative distribution function (CDF) of a normal distribution. The normal distribution is a probability distribution that describes how many novels have a certain number of pages.

The mean number of pages in a novel is given as 525 and the standard deviation is 200. We know that 30% of the novels have fewer than 400 pages, which corresponds to a z-score of (400 - 525) / 200 = -0.75.

We can use the cumulative distribution function (CDF) to find the probability that at least 20 of the novels have fewer than 400 pages. The CDF of a normal distribution gives the probability that a random variable is less than or equal to a certain value.

The probability that at least 20 of the novels have fewer than 400 pages is the same as the probability that at most 30 of the novels have more than 400 pages. Using a standard normal table or software, we can find the probability that a standard normal random variable is less than -0.75 as P(X< -0.75) = 0.2266, this is the probability that less than 30 novels have more than 400 pages.

Hence, the probability that at least 20 of the novels have fewer than 400 pages is 1 - 0.2266 = 0.7734 or 77.34%.

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3 has a mean of 120 and a standard deviation of 3.

Describe standard deviation using an example?

The dispersion of the data around the mean value is measured by the standard deviation. It might be helpful when comparing data sets that may have the same mean but a different range.

                                The means of the two numbers 15, 15, 15, 14, 16, and 2, 7, 14, 22, 30 are the same, for instance. The second is, however, obviously more dispersed.

mean of sample means = true mean = 120

std dev of sample mean = true std / sqrt(n)

                                     = 15/5 = 3

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The equations that are equivalent are:

2 + x = 5

x + 1 = 4

-5 + x = -2

If any two or more equations are equivalent, they would have the same value when evaluated.

To find which equations are equivalent, solve to find the value of x in each given equation.

A. 2 + x = 5

x = 5 - 2

x = 3

B. x + 1 = 4

x = 4 - 1

x = 3

C. 9 + x = 6

x = 6 - 9

x = -3

D. x + (-4) = 7

x  = 7 + 4

x = 11

E. -5 + x = -2

x = -2 + 5

x = 3

The equivalent equations are:

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Answer:

draw a line between an empty point at 0 and a filled point at 3

Step-by-step explanation:

To graph this inequality we first want to isolate the y variable to make it a bit easier to deal with. This is a compound inequality and when isolating the y variable instead of just doing an operation on both sides, we do it to all sides which follows the same principle of maintaining equality.

We start with the original inequality:
[tex]-4 \le -2(y-1) < 2[/tex]

From here we divide by -2 on all sides, but since we're dividing by a negative we would flip the way the inequality is pointing so we get:
[tex]2\ge y-1 > -1[/tex]

From here we add 1 to all sides.

[tex]3 \ge y > 0[/tex]

Although generally we would write this as:

[tex]0 < y \le 3[/tex]

Now to graph this we would draw a hole on the number line at the point zero, and a filled point on the number line at 3, since 3 is included (since less than or equal to 3) and then just connect the two points. I'll include an image that demonstrates this.

Answer:

aₙ = 9 + 2n

Step-by-step explanation:

Formula for the nth term of an arithmetic sequence, aₙ with a common difference of d and first term of a₁ is

aₙ = a₁ + d(n-1)

The common difference is the difference between two consecutive terms and is a constant

Here d = 13- 11 = 15-13 = 2

First term is 11

nth term:

aₙ = 11 + 2(n-1)

aₙ = 11 + 2n -2

aₙ = 9 + 2n

So if you wanted the 10 term say it would be

a₁₀ = 9 + 2x 10 = 9 + 20 = 29

The regression equation to predict the head circumference of a child who is 24.25 inches tall y=17.20 inches

The regression line with the least squares

y = 0.1827*x + 12.4932

Children that are 25.25 inches tall should have a mean head circumference that we can anticipate.

Let x = 25.75

y is thus equal to 0.1827*25.75 plus 12.4932.

b) The mean head circumference of kids who are 25.25 inches tall falls within the 95% confidence interval of

The Mean of the head circumference is 17.327, the standard deviation is 0.219, there are 11 participants, and there are 10 participants in step c.

y = 0.1827*x + 12.4932

The head circumference of a youngster who is 25.25 inches tall must be predicted.

Let x = 25.75

y is thus equal to 0.1827*25.75 plus 12.4932.

y=17.20 inches.

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y-1/7x-2 & x-7y=4 are intersecting but not parallel or perpendicular lines.

Two lines are parallel if they have the same slope (or no slope at all), and two lines are perpendicular if the product of their slopes is -1. To determine if lines are parallel or perpendicular, you can find their slopes and check if they are equal or if the product of their slopes is -1.

The first line y-1/7x-2 can be rewritten in slope-intercept form y = mx + b as y = 1/7x + 2

The second line x-7y=4 can be rewritten in slope-intercept form y = mx + b as y = x/7 - 4/7

The slopes of the two lines are 1/7 and -1/7 respectively. The product of the slopes of two lines is 1/49 which is not -1, that means that the two lines are not perpendicular. Also, the slopes are not equal, which means that the lines are not parallel.

Therefore, the two lines y-1/7x-2 & x-7y=4 are intersecting but not parallel or perpendicular lines.

Answer:

Step-by-step explanation: Hello!

To find angle EOD, you are already given two angle measurements.  The measure of angle AOB is 55 degrees and the measure of angle BOC is 30 degrees.  The important thing that you have to remember to solve this problem is that vertical angles are congruent. (I won't be explaining the definition of vertical angles, but you can find a lot of images and explanations online). This means the two angles formed by two lines intersecting each other in any way is always congruent.  Angles AOB and EOD are congruent by the definition of vertical angles.  This means that the measure of angle EOD is 55 degrees.  

Now, you have to find the measurement of angle DOC.  By the definition of straight lines, you know that the angles formed by a straight line all add up to 180 degrees.  This means that:

EOD + DOC + COB = 180 degrees.  You are already given two of these measurements.  (Angle EOD which you just figured out and Angle COB which was already given).  Fill these numbers in the equation.

55 + DOC + 30 = 180.  Combine like terms (55 + 30)

85 + DOC = 180.  Then subtract 85 from both sides using the subtraction property of equality.

(85 - 85) + DOC = (180 - 85)

DOC = 95.

The measure of angle DOC = 95.

You can check this by substituting the new measurement for angle DOC back into the equation.

Does 55 + 30 + 95 = 180?

85 + 95 = 180

180 = 180.

The measure of angle DOC is 95 degrees and the measure of angle EOD is 55 degrees.

The solutions to this equation are x=5 and x=2.

What is the factor of the equation?

A factor in an expression is something that is multiplied by something else. It can be a number, variable, term or any other longer expression. For example, the factors of 2xy are 2, x and y.

We have,

(√x-1) - 5 = x - 8

To solve this equation, you can start by isolating the variable (x) on one side of the equation.

You can begin by adding 5 to both sides of the equation, which will give you (√x-1) = x-3.

Then, you can square both sides of the equation, which will give you x-1 = x^2-6x+9.

To solve for x, you can add 1 to both sides, which will give you x^2-6x+10=0.
You can then factor this equation to get (x-5)(x-2)=0.

Hence, The solutions to this equation are x=5 and x=2.

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The surface area of the cuboid is 94 m² while The surface area of the triangular pyramid is 259.695 in²

An equation is an expression showing the relationship between numbers and variables.

Surface area is the sum of each area of the solid surface.

7) For the cuboid:

Surface area = 2(3 m * 4 m) + 2(3 m * 5 m) * 2(4 m * 5 m) = 94 m²

The surface area of the cuboid is 94 m²

8) For the triangular pyramid:

Surface area = 3(1/2 * 17.4 in * 8.7 in) + (1/2 * 8.7 in * 7.5 in) = 259.695 in²

The surface area of the triangular pyramid is 259.695 in²

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The dimensions that maximize the area of the window are:

[tex]$P=2 h+w+\frac{\pi \cdot w}{2}=30$[/tex]

[tex]$2 h+(1+0.5 \pi) w=30$[/tex]

[tex]$h=\frac{30-(1+0.5 \pi) w}{2}=15-(0.5+0.25 \pi) w$[/tex]

With the restriction for the perimeter [tex]$(\mathrm{P}=30)$[/tex], we can express h in function of w. Now, we can express the area only in function of w and maximize its value:

[tex]& A=A_c / 2+A_r=\frac{1}{2} \cdot \frac{\pi w^2}{4}+h w=\frac{\pi w^2}{8}+\left[15-\left(\frac{1}{2}+\frac{\pi}{4}\right) w\right] \cdot w \\[/tex]

[tex]& A=15 w-\left(\frac{1}{2}+\frac{\pi}{4}-\frac{\pi}{8}\right) w^2=15 w-\left(\frac{1}{2}+\frac{\pi}{8}\right) w^2[/tex]

To maximize the area, we derive and equal to 0 :

[tex]$\frac{d A}{d w}=15(1)-\left(\frac{1}{2}+\frac{\pi}{8}\right)(2 w)=0$[/tex]

[tex]$$15-(1+\pi / 4) w=0$$[/tex]

[tex]$w=\frac{15}{1+\pi / 4} \approx 8.4$[/tex]

Now, we can calculate the height as:

[tex]$$h=15-(0.5+0.25 \pi) w$$[/tex]

[tex]$$h \approx 15-(1.2854) \cdot 8.4=15-10.8=4.2$$[/tex]

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Answer:

-9,-6,6,12

Step-by-step explanation:

The ratio of a to d can be expressed by multiplying the ratio of a to b, b to c, and c to d. Therefore, a to d = (a to b) x (b to c) x (c to d).

The ratio of a to d can be determined by using the given ratio of a to b, b to c, and c to d. To begin, the ratio of a to b can be expressed as a:b, the ratio of b to c can be expressed as b:c, and the ratio of c to d can be expressed as c:d. Then, the ratio of a to d can be determined by multiplying the ratios of a to b, b to c, and c to d. This can be written as (a:b) x (b:c) x (c:d). Therefore, the ratio of a to d can be expressed as (a:b) x (b:c) x (c:d). For example, if the ratio of a to b is 2:3, the ratio of b to c is 4:5, and the ratio of c to d is 6:7, then the ratio of a to d would be (2:3) x (4:5) x (6:7) or 24:35.

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The dollar is weakening in comparison to the euro, making European goods more expensive for Americans. American consumers must spend more to purchase the same amount of goods from Europe.

When the dollar price of the euro increases from $1.50 to $2.00, it means that the euro has strengthened relative to the dollar. This means that the dollar has weakened in comparison to the euro. This weakened dollar results in American consumers needing to spend more to purchase European goods. As the dollar price of the euro increases, it takes more dollars to purchase the same amount of euros, meaning the same amount of goods from Europe will cost more dollars. This means that European goods become more expensive to Americans as the dollar price of the euro increases. This is a result of the weakened dollar and the strengthened euro in comparison to each other.

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The determinant of a matrix is a scalar value that can be used to determine if a set of vectors is linearly independent.

It is calculated by taking the product of the elements in each row or column and subtracting the product of the elements in the other row or column. For example, if we have a matrix with two columns and two rows, A and B, the determinant can be calculated using the following formula: det(A) = (A11*A22) - (A12*A21). If the determinant is equal to zero, then the set of vectors is linearly dependent, as this implies that all of the elements in the matrix are multiples of each other. On the other hand, if the determinant is non-zero, then the set of vectors is linearly independent. This can be seen because all of the elements in the matrix are not multiples of each other and thus the set of vectors cannot be expressed as a linear combination of each other.

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The score of fourth test is 95

The mean, also known as the average or the arithmetic mean, is a measure of central tendency that represents the sum of a set of values divided by the number of values in that set. It is one of the most common ways to summarize a set of data and is often used as a reference point for other measurements such as standard deviation. It is represented by the Greek letter "mu" (µ) for population mean and "x bar" for sample mean.

Given mean of the score is 80.5

mean of score is given as (∑ score) / n

where ∑ score is sum of score of all marks and n is the number of test he had attempted

∑ score  = 62 + 75 +90 +x

where x is marks in fourth subject

so ∑ score = mean * 4

=> 227 + x = 80.5 *4

=> x = 322 -227

so x = 95

so the marks of the fourth test is 95.

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P(at least n times) = 1 - (1 - p)^k, where p is the probability of the event happening and k is the number of trials.

The probability of an event happening at least n times out of k trials can be calculated using the formula P(at least n times) = 1 - (1 - p)^k. Here, p is the probability of the event happening, and k is the number of trials. The formula is based on the principle that the probability of an event happening at least n times is equal to one minus the probability of it happening less than n times. The probability of it happening less than n times is calculated by taking the probability of the event happening once, and then multiplying it by itself k times. This is because each trial is independent, and the probability of the event happening for each trial is the same. The result of this multiplication is then subtracted from one, which gives us the probability of it happening at least n times out of k trials

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