Find the differential of each function. (a) y = x2 sin 8x dy = X (b) y = 4+ dy =

Answer:

a) For help, plot the points on the graphing calculator.

b) Generate a linear regression equation:

y = -2.2857x + 16.8571

y = (-16/7)x + (118/7)

c) See part b.

d) The data shows a negative association.

e) We expect the number of losses to decrease by about 2.2857 per week. The y-intercept, 16.8571, is meaningless since the gamer received the video game at

x = 0.

The expected number of smokers in a random sample of 150 students from this university is 15.

To calculate the expected number of smokers in a random sample of 150 students at a university where 10% of students smoke, you simply multiply the total number of students in the sample by the percentage of students who smoke:
Expected number of smokers = Total number of students x Percentage of smokers
= 150 students x 10%
= 150 x 0.10
= 15
So, if we know that 10% of students smoke at this university, and we have a random sample of 150 students, we can calculate the expected number of smokers as follows:

Expected number of smokers = 150 x 0.10 = 15

Therefore, we can expect that there will be approximately 15 smokers in a random sample of 150 students from this university.


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To set up a partial fraction decomposition for a rational expression, we want to express it as a sum of simpler fractions, with each denominator being a linear factor (i.e. a factor of the form ax + b, where a and b are constants). The general form of a partial fraction decomposition is:

f(x) = A/(ax + b) + B/(cx + d) + ...

where A, B, etc. are constants that we'll need to solve for.

Note that we're not trying to find specific values for A, B, etc. in this question - we're just setting up the decomposition.

So, for each rational expression, we'll need to factor the denominator into linear factors (if it's not already in that form). Then we'll set up the partial fraction decomposition using the formula above. Here are a few examples:

Example 1: (x^2 + 5x + 6)/(x^2 + 4x + 3)

First, let's factor the denominator: x^2 + 4x + 3 = (x + 1)(x + 3). So we can write:

(x^2 + 5x + 6)/(x^2 + 4x + 3) = A/(x + 1) + B/(x + 3)

Note that we have two linear factors in the denominator, so we need two terms in the partial fraction decomposition. We don't know what A and B are yet - we'll need to solve for them.

Example 2: (2x + 5)/(x^2 - 4)

The denominator here is not yet in factored form, so we'll need to factor it first: x^2 - 4 = (x + 2)(x - 2). Then we can write:

(2x + 5)/(x^2 - 4) = A/(x + 2) + B/(x - 2)

Again, we have two linear factors in the denominator, so we need two terms in the partial fraction decomposition.

Example 3: (4x^2 - 2x + 1)/(x^3 + x)

The denominator here is not in factored form, so we'll need to factor it: x^3 + x = x(x^2 + 1). Then we can write:

(4x^2 - 2x + 1)/(x^3 + x) = A/x + B/(x^2 + 1)

In this case, we have one linear factor (x) and one quadratic factor (x^2 + 1), so we need two terms in the partial fraction decomposition.

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There are 9,075,135,300 possible 9 card hands that can be made from a set of 36 unique cards.

This is a combination problem, where we want to select 9 cards from a set of 36 cards.

The order of the cards in the hand does not matter, so we need to use the formula for combinations:

n C r = n! / (r! * (n-r)!)

where n is the total number of items, r is the number we want to select, and ! denotes the factorial function.

In this case, we have n = 36 and r = 9. So, the number of 9 card hands we can make is:

36 C 9 = 36! / (9! * (36-9)!)

= (36 x 35 x 34 x 33 x 32 x 31 x 30 x 29 x 28) / (9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1)

= 9,075,135,300

Therefore, there are 9,075,135,300 possible 9 card hands that can be made from a set of 36 unique cards.

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To determine which interval contains the root of f(x) = 2x - x3 + 2, we need to examine the behavior of the function around the x-axis.

First, we can find the critical points by setting f(x) = 0: 0 = 2x - x3 + 2
Rearranging, we get: x3 - 2x + 2 = 0

This is a cubic equation, which can be difficult to solve exactly. However, we can use the Intermediate Value Theorem to determine whether there is a root in a given interval.

One critical point is x ≈ -1.7693. We can test whether there is a root in the interval (-∞, -1.7693) by evaluating f(x) at a point in the interval, such as x = -2:

f(-2) = 2(-2) - (-2)3 + 2 = -12

Since f(-2) is negative and f(x) is a continuous function, there must be at least one root in the interval (-∞, -1.7693).

Another critical point is x ≈ 1.7693. We can test whether there is a root in the interval (1.7693, ∞) by evaluating f(x) at a point in the interval, such as x = 2: f(2) = 2(2) - 23 + 2 = 0.

Since f(2) is zero and f(x) is a continuous function, there must be at least one root in the interval (1.7693, ∞).

Therefore, the intervals that contain the root of f(x) = 2x - x3 + 2 are (-∞, -1.7693) and (1.7693, ∞).
To determine which interval contains the root of the function f(x) = 2x - x^3 + 2, we can follow these steps:

Step 1: Identify the intervals of interest. For this question, the intervals are not specified, so we will assume the intervals are (-∞, 0) and (0, ∞).

Step 2: Check the value of f(x) at the endpoints of each interval. In our case, we will check f(0) for both intervals. f(0) = 2(0) - (0)^3 + 2 = 2.

Since f(0) > 0, we know that there is a root between the intervals (-∞, 0) and (0, ∞) if there's a change of sign between the intervals.

Step 3: Check the sign of f(x) within each interval. Pick a representative point from each interval and evaluate f(x) at that point.

For the interval (-∞, 0), let's pick x = -1:

f(-1) = 2(-1) - (-1)^3 + 2 = -1
For the interval (0, ∞), let's pick x = 1:
f(1) = 2(1) - (1)^3 + 2 = 3

Step 4: Determine which interval contains the root based on the change of sign.

The function f(x) changes its sign from negative to positive as we move from the interval (-∞, 0) to the interval (0, ∞). Therefore, the interval that contains the root of the function f(x) = 2x - x^3 + 2 is (-∞, 0).

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Jalen need to buy a tire of 69.08 m.

Given that, the tire diameter is 24 inches, we need to calculate the size tire does Jalen need to buy,

To find the same, we will calculate the circumference of the tire,

Circumference = π × diameter

= 3.14 × 22

= 69.08

Hence, Jalen need to buy a tire of 69.08 m.

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Answer:

B = {(-4,2), (-2,4), (0,7), (2,9)}

Step-by-step explanation:

Answer:

Step-by-step explanation:

-1/3 and - 2/3

can be written as

-11/33 and -22/33

so 4 rational numbers between these are:

-13/33, -14/33, -17/33 and - 19/33.

If at the beginning of the year, a company estimates total overhead costs of $1,309,620. The amount of overhead should be applied to a job that uses 30 machine hours that year is: 13,140.

Overhead rate per machine hour = Total estimated overhead costs / Estimated number of machine hour

Overhead rate per machine hour = $1,309,620 / 2,990

Overhead rate per machine hour  = $438 per machine hour

Overhead applied to job = Overhead rate per machine hour x Number of machine hours used

Overhead applied to job = $438 x 30

Overhead applied to job = $13,140

Therefore, the amount of overhead is $13,140.

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Answer:

-4/3 = -1 1/3 (In decimal form: -1.3)

Step-by-step explanation:

f(x) = -4/3x

(The derivative of ax^n is nax^n-1.)

-4/3x^1-1

(Subtract 1 from 1.)

-4/3x^0

(For any term t except 0, t^0 = 1.)

-4/3

The x-intercept and the y-intercept of the function

1.(8, 6)

2. (4.5, 6)

We have,

1. f(x) = -3/4x + 6

2. f(x) = -4/3x + 6

So, to find x intercept put f(x)= 0

1. 0 = -3/4x + 6

-6 = -3/4x

x = 24/3

x= 8

2. 0= -4/3x + 6

-4/3x = -6

x= 18/4

x= 4.5

Now, to find y intercept put x = 0

1. f(x) = -3/4(0)+6 =

2. f(x) = -4/3(0) +6 = 6

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A bar chart or box plot would be the most appropriate graphical representation to display the given data. The correct option is A.

The best graphical representation to display the given data would be a bar chart, also known as a bar graph.

A bar chart is a graph that represents categorical data with rectangular bars, where the height or length of each bar corresponds to the frequency or relative frequency of the category. In this case, the categories are the types of items purchased (Health & Medicine, Beauty, Household, and Grocery), and the frequency is the number of purchases in each category.

A box plot would not be appropriate for this data because it is not numerical data and cannot be separated into quartiles or percentiles. A line plot would also not be appropriate because it is used to display individual data points rather than grouped data.

A histogram would not be appropriate because it is used to display continuous numerical data rather than categorical data. A stem-and-leaf plot would not be appropriate because it is also used to display numerical data.

Therefore, a bar chart would be the most appropriate graphical representation to display the given data.

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Answer: y = 1x - 1

Step-by-step explanation: To make the equation using y = mx +b, we need to find the slope of the line and the y intercept (the y value of the graph when the line goes through the y axis).

To find the slope (m), we need to calculate the rise over run or the change in y over the change in x value. Because it is a straight line, the slope is the same throughout the line. Let's choose two points: (2,1) and (-2,-3). Now we use the formula:

Δy/Δx or (y2 - y1)/(x2 - x1)

In this case y2 = 1, x2 = 2, y1 = -3, and x1=-2

Plug in the values in the equation to give...

(1 - (-3)) / (2 - (-2)) = 4/4 = 1

Thus the slope is 1.

This makes sense since the line increases 1 block of height for every 1 block is travels horizontally.

Next, you will need the y-intercept which is -1 because the line intercept the y axis at the value of -1 so the b value is -1.

Finally, plug the values into the y=mx+b to get

y = 1x - 1 or y = x - 1

(x and 1x are the same thing)

Therefore, the diameter of the sphere is approximately 20.2 feet when the volume is 6329 cubic feet.

The formula for the volume of a sphere is V = (4/3)πr³, where r is the radius of the sphere. To find the diameter, we need to find the radius first.

(4/3)πr³ = 632

r³ = (3/4)(6329/π)

r = ∛(3(6329/4π))

r ≈ 10.1 feet (rounded to one decimal place)

The diameter of the sphere is twice the radius, so:

d = 2r

≈ 20.2 feet (rounded to one decimal place)

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To find the center and radius of the sphere whose equation is given by x²+y²+z²+4x−2z−8=0, follow these steps:

Step 1: Rewrite the given equation in the standard form of a sphere.
The standard form of a sphere's equation is (x-a)²+(y-b)²+(z-c)²=r², where (a, b, c) is the center and r is the radius.

Step 2: Complete the squares for the x and z terms.
(x²+4x)+(y²)+(z²-2z)=8
(x+2)²-4+(y²)+(z-1)²-1=8

Step 3: Move the constants to the other side of the equation.
(x+2)²+(y²)+(z-1)²=13

Now the equation is in standard form. We can identify the center and radius. Step 4: Identify the center and radius.
The center (a, b, c) = (-2, 0, 1), and the radius r = √13. So, the center of the sphere is (-2, 0, 1), and the radius is √13.

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The requried statements about the number of possible solutions are shown below.

The correct statements are:

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There are several potential sources of probability in this study that could affect the results.

Selection bias could occur if the 249 individuals chosen for the study were not representative of the larger population of obese individuals. For example, if the study only recruited participants from a certain geographic area or demographic group, the results may not be generalizable to other populations.

Measurement bias could occur if the methods used to measure BMI were inaccurate or inconsistent. If the measurements were taken in a non-standardized way, or if the same person was not consistently measuring BMI throughout the study, the results may not be reliable.

Attrition bias could occur if participants dropped out of the study at different rates depending on whether they received the new drug or a placebo. For example, if participants who experienced negative side effects from the new drug were more likely to drop out, the results may overestimate the drug's effectiveness.

Reporting bias could occur if participants in the study provided inaccurate or incomplete information about their weight or BMI. For example, if participants underreported their weight or failed to record their weight on certain days, the results may not be accurate.

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The mean, median and mode for the data-set in this problem is given as follows:

Before obtaining the measures, we obtain the ordered data-set, as follows:

200, 202.6, 228.7, 281.4, 334, 356.2, 359, 453, 652.7, 936.5.

The mean is given by the sum of all observations divided by the number of observations, hence:

Mean = (200 + 202.6 + 228.7 + 281.4 + 356.2 + 334 + 359 + 453 + 652.7 + 936.5)/10

Mean = $400.41 million.

The data-set has an even cardinality, hence the median is given by the mean of the two middle elements, as follows:

Median = (334 + 356.2)/2

Median = $345.1 million.

The data-set does not have a mode, as there is no observation that appears more than once. The mode of a data-set is the observation that appears the most times in a data-set.

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The measures of the angles and the proofs are shown below

Circle 4

The angle at the centre is twice the angle at the circumference

So, we have

360 - ∠BOD = 2 * 110

Evaluate

∠BOD = 140

Circle 5

Angle in a semicircle is 90 degrees

So, we have

∠ABD + 19 = 90

∠ABD = 71

Angles in the same segment are equal

So, we have

∠ACB = 19

Circle 6

Angle in a semicircle is 90 degrees

So, we have

5y + y = 90

y = 15

So, we have

∠BAC = 5 * 15

∠BAC = 75

Circle 7

By corresponding angle theorem, we have

∠ABO = ∠CDO

By the sum of opposite internal angles in a triangle, we have

∠BOC = ∠BAO + ∠ABO

Substitute ∠ABO = ∠CDO

∠BOC = ∠BAO + ∠CDO --- proved

The angles at the edges are equal because they are corresponding angles of congruent isosceles triangles

Cyclic Quadrilateral

The opposite angles of cyclic quadrilaterals add up to 180 degrees

So, we have

180 - ∠x + 180 - ∠y = 180

Evaluate

∠x + ∠y = 180 --- proved

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An equation of the line of the graph is y = 4x/5 + 4.

A graph of this equation is shown below.

In Mathematics and Geometry, the point-slope form of a straight line can be calculated by using the following mathematical equation (formula):

y - y₁ = m(x - x₁)

Where:

First of all, we would determine the slope of this line;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (8 - 4)/(5 - 0)

Slope (m) = 4/5

At data point (0, 4) and a slope of 4/5, a linear equation for this line can be calculated by using the point-slope form as follows:

y - y₁ = m(x - x₁)

y - 4 = 4/5(x - 0)  

y = 4x/5 + 4

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Therefore, the area of the tile shown is approximately 58 cm^2, which is closest to the first option, 58 cm^2.

We know that BC = 3 cm and CD = 7 cm. We also know that AD = 4 cm and BD = 6 cm. To find the length of AB, we can use the Pythagorean theorem:

AB^2 = Ad² + BD²

AB^2 = 4² + 6²

AB² = 52

AB = √(52) =

2 * √(13) cm

Area = (1/2) x (sum of parallel sides) x (distanc)

In this case, the sum of the parallel sides is AB + BC = 2sqrt(13) + 3 cm, and the distance between them is CD = 7 cm. So:

Area = (1/2) x (2* √(13) + 3) x 7

Area = (√(52) + 3/2) x 7

Area ≈ 58 cm²

Therefore, the area of the tile shown is approximately 58 cm^2, which is closest to the first option, 58 cm^2.

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The older device will finish the final 1/6 mile in 4/3 hours. After the new machine stops operating, the task would therefore take the older machine 4/3 hours to complete.

Find out first how much of the new machine's route it covers in 4 hours:

Since the new machine takes 12 hours to complete a half-mile section, it takes 6 hours to complete a quarter-mile section (half of a half-mile). Therefore, in 4 hours, it would complete:

4 / 6 = 2 / 3 of a quarter-mile section

This means that there is still a remaining distance of:

1/4 - 2/3(1/4) = 1/6 mile

The older machine can finish a half mile in sixteen hours, which translates to a quarter mile in eight.  Therefore, it can complete the remaining 1/6 mile in:

(1/6) / (1/4) * 8 = 4/3 hours

Thus, it would take the older machine 4/3 hours to complete the job.

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In the original derivation of logistic regression from Naive Bayes assumptions, we assumed that the variance σ^2 of a class-conditional probability distribution is independent of class index k and feature index j. Now, by generalizing and allowing σ^2_jk to depend on both indices, the class-conditional probability distribution p(x|y=k) is now affected by this change.

This new assumption affects the logistic regression formula p(y|X) because it no longer relies on the original independence assumption. Consequently, the logistic regression model will need to account for the new variances σ^2_jk, which depend on both class index k and feature index j.

The new form of logistic regression will likely be different from the original formula, as it must now accommodate the modified variances in class-conditional probability distributions. Unfortunately, without more information, it is not possible to provide the exact new form of logistic regression here. However, it's important to note that this new form should consider the dependency of σ^2_jk on both indices j and k.

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The first four non-zero terms of the Taylor series expansion of f(x)=e^x sin x, centered at c=0, are: f(x) = x + x^2/2 + x^3/3! + ...

To find the Taylor series expansion of f(x)=e^x sin x, we need to first find the Taylor series expansions of e^x and sin x centered at c=0.

The Taylor series expansion of e^x centered at c=0 is:

e^x = 1 + x + (x^2)/2! + (x^3)/3! + ...

And the Taylor series expansion of sin x centered at c=0 is:

sin x = x - (x^3)/3! + (x^5)/5! - (x^7)/7! + ...

To find the Taylor series expansion of f(x)=e^x sin x, we need to multiply these two series together. We can do this using the "r series" method, where we take the product of the first r terms of each series and then add up all the resulting terms.

So the first term of the series for f(x) is simply the product of the first term of each series:

f(x) = e^0 * sin(0) = 0

The second term is the sum of the product of the second term of the e^x series and the first term of the sin x series, and the product of the first term of the e^x series and the second term of the sin x series:

f(x) = e^0 * sin(x) + e^x * sin(0) = x

The third term is the sum of the product of the third term of the e^x series and the first term of the sin x series, the product of the second term of the e^x series and the second term of the sin x series, and the product of the first term of the e^x series and the third term of the sin x series:

f(x) = e^0 * sin(x) + e^x * sin(0) + (x^2)/2! * sin(x) = x + x^2/2

The fourth term is the sum of the product of the fourth term of the e^x series and the first term of the sin x series, the product of the third term of the e^x series and the second term of the sin x series, the product of the second term of the e^x series and the third term of the sin x series, and the product of the first term of the e^x series and the fourth term of the sin x series:

f(x) = e^0 * sin(x) + e^x * sin(0) + (x^2)/2! * sin(x) + (x^3)/3! * sin(0) = x + x^2/2 + x^3/3!

So the first four non-zero terms of the Taylor series expansion of f(x)=e^x sin x, centered at c=0, are:

f(x) = x + x^2/2 + x^3/3! + ...

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Answer:

Height of helicopter above ground = 13.63 feet

Step-by-step explanation:

See attached image to support explanation

B is the point vertically below where the helicopter is located

s is the distance from Sofie to B

d is the distance from Danika to B

We have
s + d = 100 ==> s = 100 -d

h is the height of the helicopter from the base

Both triangles are right triangles

For a right triangle,
tan x = Side opposite hypotenuse/Side adjacent to hypotenuse
where x is the angle between the side adjacent to the hypotenuse

Using this information for both triangles we get

[tex]\tan 10 = \dfrac{h}{s}\\or\\h = s ( \tan 10)\\\\\tan 31 = \dfrac{h}{d}\\or\\h = d (\tan31)\\\\[/tex]

Therefore
s (tan 10) = d ( tan 31)

But s = 100 -d:
(100-d) tan 10 = d ( tan 31)

100(tan 10) - d(tan 10) = d (tan 31)

Switch sides:
d (tan 31) = 100 (tan 10) - d( tan 10)

Add d (tan 10) to both sides:
d (tan 31) + d ·(tan 10) = 100(tan 10)

d(tan 31 + tan 10) = 100 (tan 10)

[tex]d = \dfrac{100(\tan 10)}{\tan 31 + \tan 10}[/tex]

Using a calculator we can compute right side as

[tex]\dfrac{100(\tan 10)}{\tan 31 + \tan 10} = 22.6878[/tex]

So
d = 22.6878

Plug this value of d into h = d sin 31 to get
h = d (tan 31)

h = 22.688 (0.6009)

h = 13.6322....

= 13.63 rounded to 2 decimal places

Height of helicopter above ground = 13.63 feet

The relative maximum point in April 2005, was 100.4; the relative minimum point in May 2004, was 71.0; the saddle point in June 2006, was 84.8.

The April 2007 price of 98.6 cents per pound is a saddle point because it is larger than the two adjacent prices in the same row (91.5 and 87.9), but smaller than the two adjacent prices in the same column (86.9 and 100.4).

The April 2008 price of 90.2 cents per pound is a relative minimum because it is smaller than all eight surrounding prices.

The three additional critical points in the table are:

1. Relative maximum point: April 2005, 100.4
2. Relative minimum point: May 2004, 71.0
3. Saddle point: February 2006, 79.4 (larger than the two adjacent prices in the same row, but smaller than the two adjacent prices in the same column).

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Answer:

A rectangle's perimeter and its area have

the same numerical value. The length of the

rectangle is 6 centimeters.

Write an equation that can be used to find x, the

width of the rectangle in centimete

Step-by-step explanation:

Answer :

According to the question it's given that,

A rectangle's perimeter and its area have the same numerical value. The length of the rectangle is 6 centimeters.

Required Formulas,

[tex]:\implies[/tex] perimeter of rectangle is 2(l+ b)

[tex]:\implies[/tex] Area of rectangle = l × b

Also, Length of rectangle is 6 cm.

Perimeter of rectangle

[tex]:\implies[/tex] 2(6 + x)

[tex]:\implies[/tex] 12 + 2x

Area of rectangle

[tex]:\implies[/tex] l × b

[tex]:\implies[/tex] 6 × x

[tex]:\implies[/tex] 6x

Now, A rectangle's perimeter and its area have the same numerical value.

Perimeter of rectangle = Area of rectangle

[tex]:\implies[/tex] 12 + 2x = 6x (required equation)

Therefore this is the required equation to find the width of the rectangle.

The value of cos (x + pi) is -✓3/2, based on the stated information and known trigonometric values.

As per the known fact, the value of x wil be 30° as it is the specific value whose cosine or cos is ✓3/2. Now, we also know that π represents 180°. Also, the formula for cos (a + b) is cos A cos B - sin A sin B.

So, cos (x + pi) will be -

cos x cos pi - sin x sin pi

Keeping the values and solving -

cos (x + pi) = cos 30 cos 180 - sin 30 sin 180

cos (x + pi) = (✓3/2 × -1) - (1/2 × 0)

cos (x + pi) = -✓3/2

Hence, the value of cos (x + pi) is -✓3/2.

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Answer:

The two points have the same y-coordinate of -20, so they lie on the same horizontal line.

Step-by-step explanation:

To find the horizontal distance between them, we can simply subtract their x-coordinates:

distance = 7 - (-14) = 7 + 14 = 21

Therefore, the horizontal distance between (–14, –20) and (7, –20) is 21 units.

Answer:

Step-by-step explanation:

21 units

The coordinates of the image of the triangle RST following a dilation by a with the origin as the center of dilation and a scale factor of 4 are;

A. R'(4, 12), S'(12, 12), T'(8, 4)

A dilation transformation is a transformation in which the image dimensions are obtained by resizing the dimensions of the pre-image using a scale factor.

The vertices of the triangle RST are; R(1, 3), S(3, 3), and T(2, 1)

The coordinates of the image of the point (x, y) following a dilation by a scale factor of a about the origin is; (a·x, a·y)

Therefore, the coordinates of the dilated image of the triangle RST after a dilation with the origin as the center of dilation and a scale factor of 4 are;

R(1, 3) ⇒ R'(4 × 1, 4 × 3) = R'(4, 12)

S(3, 3) ⇒ S'(4 × 3, 4 × 3) = S'(12, 12)

T(2, 1) ⇒ T'(4 × 2, 4 × 1) = T'(8, 4)

The correct option is therefore;

A. R'(4, 12), S'(12, 12), T'(8, 4)

Learn  more on dilation transformation here: https://brainly.com/question/29449871

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