What is the proportion and time?

What Is The Proportion And Time?

Answers

Answer 1

The constant of proportionality is 25 and the distance at 10 seconds is 250 m.

To find the constant of proportionality, find the slope of the graph.

m = Δy/Δxm = 50 - 25 / 2 - 1m = 25

Now, input in slope intercept form of equation to find distance at 10 seconds.

y = mxy = 25(10)y = 250 m

Related Questions

a 36 foot long pole is cut into two pieces with the ratio lengths equal to 5:7
what is the lengh of the longer piece?

Answers

5:7 = 12
36 / 12 = 3
3 x 5 = 15
3 x 7 = 21

21 feet

The function f(x) = x2 4 is defined over the interval [-2, 2]. if the interval is divided into n equal parts, what is the height of the right endpoint of the kth rectangle?

Answers

the height of the endpoint of the kth rectangle equals the heights of the first and kth preceding rectangles.

= -2 +k*(5/n)

What is Coordinate geometry?

The study of geometry utilizing coordinate points is referred to as coordinate geometry (or analytic geometry). Finding the distance between two points, dividing lines in the m:n ratio, locating a line's midpoint, and computing the area of a triangle in the Cartesian plane can all be done using coordinate geometry.

The range for the definition of the function f(x) = x^2 + 4 is (-2, 2).

Between this interval, there are a total of 5 equal pieces.

Height of each rectangle's right endpoint equals if the interval is divided into n equal pieces. k=(5/n)

Therefore, the height of the endpoint of the kth rectangle equals the heights of the first and kth preceding rectangles.

= -2 + k*(5/n)

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Classify the following function.

Answers

The equation is neither geometric nor arithmetic

How to classify the function?

The function is given as

f(x) = 2x^2 + 6x - 9

As a general rule, arithmetic functions or sequences have a common difference while geometric functions or sequences have a common difference

Set x = 0, 1 and 2

f(0) = 2(0)^2 + 6(0) - 9 = -9

f(1) = 2(1)^2 + 6(1) - 9 = -1

f(2) = 2(2)^2 + 6(2) - 9 = 11

Calculate the common difference (d)

d = 11 --1 = -1--9

d = 12 = 8 ---- false equation i.e. no common difference

Calculate the common ratio (r)

r = 11/-1 = -1/-9

d = -11 = 1/9 ---- false equation i.e. no common ratio

The above function is not an arithmetic function.

This is so because it does not have a common difference

Also, the function is not a geometric function.

This is so because it does not have a common ratio

Hence, the true statement about the function is (c) the equation is neither geometric nor arithmetic

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Samuel is arranging books in shelves at their library. He has 80 books to arrange he needs to put the same number of books on each shelf, and he needs to use all of the books. Between 9, 10 and 11 shelves, which is his best choice for the number of shelves that he can use?
(Show the solution and do not use Division (optional) and use the Divisibility rules of numbers)

Answers

Answer:

10 shelves

Step-by-step explanation:

out of the other choices, 10 is most suitable to divide with 80

9/[tex]9/3-6/10[/tex]-6/10

Answers

The value of expression 9/9/3-6/10-6/10 is 9/5.

Given an expression 9/9/3-6/10-6/10.

We are required to simplify the expression 9/9/3-6/0-6/10.

Expression is combination of numbers,fraction, coefficients, determinants,indeterminants, symbols.It is mostly not found in equal to form. It also includes algebraic operations also.

Expressions: 9/9/3-6/10-6/10

This is present in fraction which is combination of two numbers one is numerator and denominator. The numbers above division sign are known as numerator and the numbers below division sign are known as denominator.

Invert the fraction which is given in denominator.

=(9*3)/9-6/10-6/10

=27/9-6/10-6/10

Taking LCM now.

=(270-54-54)/90

=(270-108)/90

=162/90

=9/5

Hence the value of expression 9/9/3-6/10-6/10 is 9/5.

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Complete the equivalent ratio. How many ounces are in 2 cups?

StartFraction 48 ounces Over 6 cups EndFraction = StartFraction question mark ounces Over 2 cups EndFraction

Answers

1 Cup = 8 Ounces
2 Cups = (8 Ounces) x 2
2 Cups = 16 Ounces

I hope that this helps! :)

The height and weight of adults can be related by the equation y=48.3x−127 where x is height in feet and y is weight in pounds.

What does the slope of the line represent?
A. the average number of pounds per foot tall
B. the number of pounds heavier an adult one foot taller would weigh
C. the height of an adult weighing zero pounds
D. the number of adults in the sample

Answers

we conclude that the correct option is A, the slope is:

"the average number of pounds per foot tall"

What does the slope of the line represent?

The linear equation:

y = 48.3*x - 127

Relates the height, x, and the weight, y of an adult.

Then the slope, which is 48.3, should have units of mass over height.

Now, if x is in feet and y is in pounds, then the slope has units of pounds/feet.

Then it represents the mean number of pounds per feet. So we conclude that the correct option is A:

"the average number of pounds per foot tall"

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Draw at least six different sized rectangles that have an area of 64 square units then find the perimeter of each rectangle.

Answers

Six different sized rectangles that have an area of 64 square units:

1) 64 units x 1 unit
2) 32 units x 2 units

3) 16 units x 4 units

4) 40 units x 1.4 units

5) 20 units x 3.2 unit

6) 10 units x 6.4 units

For given question,

Let l be the length of the rectangle and w be the width of the rectangle.

We know that, the area of a rectangle is equal to

A = l × w

Here, A = 64 square units

So, we get an equation

l × w = 64                     ...............................(1)

let's assume different values of l to get the different values of w.

Case 1) For l = 64 units

substitute in the equation 1

⇒ 64 × w = 64

⇒ w = 64/64

⇒ w = 1 units

The dimensions of the rectangle are 64 units x 1 unit

See the draw in the attached figure 1

Case 2) For l = 32 units

substitute in the equation 1

⇒ 32 × w = 64

⇒ w = 64/32

⇒ w = 2 units

The dimensions of the rectangle are 32 units x 2 unit

See the draw in the attached figure 2

Case 3) For l = 16 units

substitute in the equation 1

⇒ 16 × w = 64

⇒ w = 64/16

⇒ w = 4 units

The dimensions of the rectangle are 16 units x 4 unit

See the draw in the attached figure 3

Case 4) For l = 40 units

substitute in the equation 1

⇒ 40 × w = 64

⇒ w = 64/40

⇒ w = 1.4 units

The dimensions of the rectangle are 40 units x 1.4 unit

See the draw in the attached figure 4

Case 5) For l = 20 units

substitute in the equation 1

⇒ 20 × w = 64

⇒ w = 64/20

⇒ w = 3.2 units

The dimensions of the rectangle are 20 units x 3.2 unit

See the draw in the attached figure 5

Case 6) For l = 10 units

substitute in the equation 1

⇒ 10 × w = 64

⇒ w = 64/10

⇒ w = 6.4 units

The dimensions of the rectangle are 10 units x 6.4 unit

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Please help! What is the equation for g(x)? According to the graph ?

Answers

Answer: [tex]g(x)=2^{x-3}[/tex]

Step-by-step explanation:

The graph of y=g(x) is the graph of y=f(x) shifted 3 units right.

Consider formula a to be v = startfraction 2 pi r over t endfraction and formula b to be v2 = gv = g startfraction m subscript central over r endfraction.. write the letter of the appropriate formula to use in each scenario. determine the tangential speed of the moon given the mass of earth and the distance from earth to the moon. determine the tangential speed of a satellite that takes 90 minutes to complete an orbit 150 km above earth’s surface.

Answers

The tangential speed of the satellite above the Earth's surface is [tex]7.588 * 10^{3} m/s[/tex].

What is Tangential speed?Tangential speed is the linear component of speed along any point on a circle that is involved in a circular motion. The object or circle moves with a constant linear speed at any point along the circle. This is known as the tangential speed.[tex]v=wr\\v=\frac{2\pi r}{T}[/tex]

The tangential speed of a satellite at the given radius and time is calculated as follows:

[tex]v=\frac{2\pi *(150*10^{3}+6371*10^{3} }{90*60} \\v=7.588*10^{3} m/s[/tex]

Therefore, the tangential speed of the satellite above the Earth's surface is [tex]7.588 * 10^{3} m/s[/tex].

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The correct question is shown below:
Consider formula A to be v = and formula B to be v2 = G. Write the letter of the appropriate formula to use in each scenario. Determine the tangential speed of the moon given the mass of Earth and the distance from Earth to the moon. Determine the tangential speed of a satellite that takes 90 minutes to complete an orbit 150 km above Earth’s surface.

Answer: first box is B

second box is A

Explanation:

right on edge as of 2022

If f(x) = 4x² + 1 and g(x)=x2-5, find (f- g)(x).
0 A. 3x2 + 6
OB. 5x²-6
OC. 5x²-4
OD. 3x² - 4

Answers

Answer:

Option A is correct.

3x^2+6

Step-by-step explanation:

We have to find (f-g)(x):

We can write it f(x)-g(x), so substitute the values:

f(x)-g(x)=(4x^2+1)-(x^2-5)

=4x^2+1-x^2+5

=3x^2+6

Estimate √50 to the hundredths place.

Answers

Answer:

7.07

Step-by-step explanation:

Answer:

7.07

Step-by-step explanation:

Hello!

Let's find two perfect square numbers that are directly before and after 50.

[tex]\sqrt{49} < \sqrt{50} < \sqrt{64}[/tex][tex]7 < \sqrt{50} < 8[/tex]

Since the square of 7 is the closest, we can use that as our whole number.

To find the decimal...

49 is 1 away from 50, and 64 is 14 away. Rewriting it as a fraction and we get  [tex]\frac{1}{14}[/tex].  The decimal is 0.07142857142.

Now, put 7 and 0.07142857142 together and we get 7.07142857142. Rounding that, we get 7.07.

The real value of Root 50 is 7.071067811865475, so the decimals were really close.

What is the Y-Intercept of the line that has a slope of -4 and passes through the point (4,-6)

Answers

The y intercept is the y intercept which is 2

Answer:

Y-intercept = 22

Step-by-step explanation:

The equation of a line in slope-intercept format is given by the equation y=mx+c

where m is the slope and c the y-intercept.

(The y-intercept is the value of y when x = 0)

Slope given as -4

And we know it passes through the point(4,6) ie at x=4, y =6

Substitute in above equation to get value of c, the y-intercept

6 = -4(4) + c

6 = -16 + c

c = 22

And this is the y-intercept

The equation of the line is y = -4x + 22

See attached figure for graph

A group of 15 teenagers owes $75 at a pizza parlor. If they split the bill evenly, how much will each person owe?

Answers

Answer:

$5 each teenager

Step-by-step explanation:

divide 75 by 15

5 dollars each teenager

75 divided by 15= 5

A shape has an area of 37 mm², of which 60%
is green.
The shape is enlarged so that all its side lengths
increase by 45%.
Work out the area of the green part of the larger
shape.
If your answer is a decimal, give it to 1 d.p.

Answers

If the side are increased by 45% then the area of green part will be 26.6955 [tex]mm^{2}[/tex].

Given that area of a shape of 37 [tex]mm^{2}[/tex] in which 60% is green.

We are required to find the area of green region if the side is increased by 45%.

Area is basically part of a surface covered by a shape.

When the side is increased by 45% then the area will increase by 45%*45%=20.25%.

Increased area =37*20.25%=7.4925

New area=37+7.4925

=44.4925

We have been given that 60% is the area of green.

Area of green region=44.4925*60/100

=26.6955 [tex]mm^{2}[/tex]

Hence if the sides are increased by 45% then the area of green part will be 26.6955 [tex]mm^{2}[/tex].

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Is (1, 3) a solution to the system of inequalities below?
y> 2x + 1
y <-3x
Why or why not?

Answers

Substitute and Check:

[tex]y > 2x + 1 \\ 3 > 2(1) + 1 \\ 3 > 3 \\ false[/tex]

We can stop here and conclude that ( 1 , 3 ) is not a solution to this system, since it does not even satisfy the first equation, but check for the other one just in case:

[tex]y < - 3x \\ 3 < - 3(1) \\3 < - 3 \\ also \: false[/tex]

The measure of central angle qrs is startfraction 8 pi over 9 endfraction radians. what is the area of the shaded sector?

Answers

The area of the shaded sector is 144π units squared.

What is a sector?A circular sector, also known as a circle sector or disk sector, is a piece of a disk bounded by two radii and an arc, with the smaller area known as the minor sector and the larger area known as the major sector.

To find the area of the shaded sector:

Given - The central angle of the sector is, θ [tex]=\frac{8\pi }{9} rad[/tex].

The radius of the circle is, [tex]R=18 units[/tex].

We know that the area of a sector of a circle of radius 'R' and central angle θ is given as:

[tex]A=\frac{1}{2} R^{2}[/tex]θ

Insert, θ [tex]=\frac{8\pi }{9} ,R=18[/tex] and obtain:

[tex]A=\frac{1}{2} *18^{2} *\frac{8\pi }{9} \\A=\frac{(324*4)}{9} \pi \\A=(36*4)\pi \\A=144\pi units^{2}[/tex]

Therefore, the area of the shaded sector is 144π units squared.

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The complete question is given below:

The measure of central angle QRS is StartFraction 8 pi Over 9 EndFraction radians. What is the area of the shaded sector? 36Pi units squared 72Pi units squared 144Pi units squared 324Pi units squared

Several properties are used to evaluate this expression. identify the property used in each step. 21 + (19 + 36): (21 + 19) + 36:

Answers

21 + (36 + 0 + 19) Equals 76.

What is the property of addition?

A final result is obtained by adding two or more integers together. Commutative, associative, distributive, and additive identity are the four major characteristics of b. b means that even if the order changes, the addition result will remain the same.

Equation to be used: 21 + (36 + 0 + 19)

The identity property of addition states that a + 0 = a.21 + (36 + 0 + 19) = 21 + (36 + 19)Using the commutative property of addition, a + b equals a + b.21 + (36 + 19) Equals 21 + (19 + 36)By using the associative property of addition, the formula is: a + (b + c) = a + b + c.21 + (19 + 36) Equals (21 + 19) + 36Put two more numbers within the bracket now.(21 + 19) + 36 = 40 + 36A + B Equals C, any number, using the closure property of addition.40 + 36 = 76Hence 21 + (36 + 0 + 19) Equals 76.

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I understand that the you are looking for is :

Several properties are used to evaluate this expression. Identify the property used in each step.

21 + (36 + 0 + 19)

21 + (36 + 19):

21 + (19 + 36):

(21 + 19) + 36:

40 + 36

76

G
Which point is located at (-3.5.-4.5)?
Y
A
(1
-5-4-3-2-1
point A
point K
point R
4
-3-
2
10
-I ? ? + 4
2
3
2 3 4
en.
5
X

Answers

the answer is Point A.

this is because if you go left 3.5 and down 4.5, you will reach point A

It takes a machine at a seafood company 20 s to clean 3 1 ib of shrimp _ 3

Answers

It takes a machine at a seafood company 20 seconds to clean 3 pounds of shrimp. The rate of the machine is 0.15 pound per second

What is an equation?

An equation is an expression that shows the relationship between two numbers and variables.

An independent variable is a variable that does not depend on any other variable for its value whereas a dependent variable is a variable that depend on any other variable for its value.

It takes a machine at a seafood company 20 seconds to clean 3 pounds of shrimp. Hence:

Rate of the machine = 3 pounds / 20 seconds = 0.15 pound per second

It takes a machine at a seafood company 20 seconds to clean 3 pounds of shrimp. The rate of the machine is 0.15 pound per second

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Which statements describe characteristics of a geometric sequence? check all that apply.

Answers

The Option A is correct that tells us that the There is a common ratio between the terms which represent the Characteristics of the G.P. Series.

According to the statement

we have to explain the characteristics of the Geometric Sequence.

So, For this purpose

We know that the

A geometric progression, also known as a geometric sequence, is a sequence of non-zero numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.

From its definition it is clear that the

There is a common ratio between the terms.

And this point represent the characteristics of the Geometric Sequence not all other points.

Now, The option A is the correct rather than the other options.

So, The Option A is correct that tells us that the There is a common ratio between the terms which represent the Characteristics of the G.P. Series.

Disclaimer: This question was incomplete. Please find the full content below.

Question:

Which statements describe characteristics of a geometric sequence? Check all that apply.

a.There is a common difference between terms

b.Each term is multiplied by the same number to arrive at the next term.

c.The sequence increases or decreases in a linear pattern

d.There is a common ratio between terms

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does someone mind helping me with this? Thank you!

Answers

Answer: 83/100, it cannot be simplified any more.

I hope that this helps! :)
Answer is 83/99.

0.83 repeating as a fraction, step by step.

The decimal (.83) times the percent based on the number of decimal places in the repeat, in this case it’s 2 places, so (100), subtract the non repeating part of the decimal (there is none so (0), divided by 9 if one repeating number, 99 if two repeating numbers, 999 if three repeating numbers, etc. in this case it is (99).

(0.83 x 100) - 0 / 99 = 83/99

Which number belongs to the set of rational numbers and the set of integers?
F. –5.5 H. –0.5
G. – 115 J. –15

Answers

The number which belongs to the set of rational numbers and the set of integers is -115 which is third option,-15 which is fourth option.

Given four options:

–5.5 –0.5– 115 –15

We are required to find the number which is included in the set of rational numbers and the set of integers.

Rational numbers are those numbers which can be written in the form of p/q in which q cannot be equal to zero because if q becomes zero then the fraction becomes infinity.

-5.5 is not a rational number,

-0.5 is also not a rational number.

-115 is a rational number and also an integer.

-15 is a rationalnumber and also an integer.

Hence the number which belongs to the set of rational numbers and the set of integers is -115 which is third option,-15 which is fourth option.

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When the shape of a bst approaches that of a perfectly balanced binary tree, what is the worst case performance characteristic of searches and insertions?

Answers

The shape of a bst approaches that of a perfectly balanced binary tree, (log2n) is the time complexity for a balanced binary search tree in case of insertions and search.

In computing, binary bushes are mainly used for looking and sorting as they offer a way to save statistics hierarchically. a few common operations that may be conducted on binary trees encompass insertion, deletion, and traversal.

A binary tree has a special situation that each node could have a most of two youngsters. A binary tree has the benefits of each an ordered array and a linked listing as search is as brief as in a taken care of array and insertion or deletion operation are as fast as in related listing.

In pc science, a binary tree is a tree information shape in which every node has at maximum two youngsters, that are known as the left baby and the proper toddler.

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Unfortunately, he has made a mistake in adding the numbers and has not allocated all of the paycheck. if he deposits the difference into the two emergency savings accounts, how much total per week can he then put towards emergency savings? a. $40 b. $60 c. $74 d. $55

Answers

The total amount he puts towards emergency savings is $74

The correct option is C.

According to the given information:

His total weekly deposits are as follows: 219+115+40+20+10+40+15 = 459

Now

that we are aware, his weekly deposits total $459 in total.

His total remuneration is $498 due to an error in his addition of the numbers.

The amount he has each week will be determined by deducting his deposits from his paycheck:

498-459 = 39

He contributes two equal payments of $20 and $15 to his emergency fund.

His entire contribution to emergency savings is = 20 + 15 = 35.

Only need to add the additional $39

To determine how much he can set aside each week for emergency savings, multiply his total emergency savings by 35 dollars:

39+35 = 74

the total per week that he can put towards emergency savings = $74

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I understand that the question you are looking for is:

Mr. Thom makes $25,900/year salary as a document processor. He has made the following chart in order to divide his weekly paycheck into his accounts: Expense type Account Weekly deposits Essential (Fixed) 1st Checking account $219 Essential (Variable) 1st Checking account $115 Non-essential 2nd Checking account $40 Other (Unexpected) Emergency savings account $20 Other (Pictable) Education investment fund $10 Other (Pictable) Retirement investment fund $40 Other (Pictable) Emergency savings account $15 Total paycheck $498 Unfortunately, he has made a mistake in adding the numbers and has not allocated all of the paycheck. If he deposits the difference into the two emergency savings accounts, how much total per week can he then put towards emergency savings?

a. $40

b. $60

c. $74

d. $55

Answer: C. $74

Step-by-step explanation:  C. $74.00

Find the missing side lengths. Leave your answers as radicals in simplest form.

Answers

The missing side length of the right triangle are as follows;

v = 1 units

u = 2 units

How to find side of a right triangle?

A right triangle has one of its angles as 90 degrees. The side of a right angle triangle can be found using trigonometric ratios.

Therefore,

tan 60 = opposite / adjacent

tan 60 = √3 / v

cross multiply

v = √3 / tan 6-

v = √3 / √3

v = 1

Hence,

sin 60 = opposite / hypotenuse

sin 60 = √3 / u

cross multiply

u = √3 / sin 60

u = √3 × 2 / √3

u = 2√3 / √3

u = 2

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Please answer quickly! Several questions from Algebra 2, on a unit about Sequences and Series, most of these have to do with Arithmetic and Geometric Series-screenshots of the questions are linked below. It would be great if you could include the question # and the answer in the answer section, and then explain it below. Thank you in advance!

Answers

The sum of the geometric series is 2199; option E.

The 36th term of the arithmetic series is -60.5 option CThe sum of the arithmetic series is 2547; option EThe missing geometric sequence are; 1.614375, 3.30946875, 6.7844109375. option E

Arithmetic and Geometric series

a1 = 1458r = 1/3a6 = 6

S6 = a(rⁿ - 1) / r -1

= 1468(1/3^6 - 1) / (1/3 - 1)

= 1468(0.00137174211248 - 1) / -2/3

= 1468(-0.9986282578875) / -0.66666666666666

= -1,465.98628257885 / -0.66666666666666

= 2198.97942386829

Approximately,

S6 = 2199

Arithmetic series

a36a1 = 27d = -5/2

Sn = n/2{2a + (n -1)d}

= 36/2 {2×27 + (36-1)-5/2}

= 18{54 + (35)-5/2}

= 18(54 + 175/2)

= 18(54 + 87.5)

= 18(141.5)

s36 = 2547

a36 = a + (n - 1) d

= 27 + (36 - 1)-5/2

= 27 + (35)-5/2

=27 + -175/2

= 27 - 87.5

= -60.5

S20 = n/2{2a + (n -1)d}

= 20/2{2×27 + (20-1)-5}

= 10(54 + (19)-5)

= 10{54 + (-95)}

= 10(54-95)

= 10(-41)

s20 = -410

Missing terms of the geometric sequence:

nth term = ar^n-1

448/135 = 63/80×r^(6-1)

448/135 = 63/80×r^5

r^5 = 448/135 ÷ 63/80

= 448/135 × 80/63

= 35,840/8,505

r = 5√35,840/5√8505

= 946.57/461.11

r = 2.05

Second term = a×r

= 63/80×2.05

= 1.614375

Third term = ar²

= 63/80×2.05²

= 63/80×4.2025

= 3.30946875

Fourth term = 63/80 × 2.05³

= 63/80×8.615125

= 6.7844109375

Therefore, none of these are correct

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Your friend won't get many stars like this! What changes would you make to the equation to help your friend collect all the stars? Why are those changes going to work

Answers

The required equation that represents the line of best fit is y = 2x + 4

Finding the equation of a line of best fit.

A line of best fit refers to a line through a scatter plot of data points that best expresses the relationship between those points.

From the given scatters plot, we only need to choose two points that aligns properly and create an equation of a line using the coordinates.

Using the following points (4, 12) and (2, 8)

The equation of the line will be in the form y = mx + b

where

m is the slope

b is the y-intercept

Determine the slope

Slope = y2-y1/x2-x1

Slope = 8-12/2-4
Sope = -4/-2
Slope = 2

Determine the y-intercept

Using the coordinate point (2, 8) and m = 2

8 = 2(2) + b

b = 8 - 4

b = 4

Hence the required equation that represents the line of best fit is y = 2x + 4

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Rewrite the function by completing the square. f(x) = x2 - 8x + 7

Answers

The function f(x) = x2 - 8x + 7 rewritten by completing the square is x² - 8x  + 16 = 9.

Rewrite the function by completing the square?

Given the function; f(x) = x² - 8x + 7

To rewrite by completing the square.

We simplify the function into a proper form to completing the square.

x² - 8x + 7 = 0

x² - 8x = -7

We create a trinomial square on the left side of the equation that is equal to the square of the half of b.

(b/2)² = (-4)²

Next, we add the term to both side of the equation.

x² - 8x + (-4)² = -7 + (-4)²

x² - 8x  + 16 = 9

Therefore, the function f(x) = x2 - 8x + 7 rewritten by completing the square is x² - 8x  + 16 = 9.

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Compute the surface area obtained by rotating the curve y = 3 x , for x is in [1, 125] about the y-axis

Answers

Answer:

Given,

y=x³ ,0≤x≤2

We have to find the surface area of the surface by rotating the curve about the x axis.

For rotation about the x axis, the surface area formula is given by-

s=2π∫ᵇₐ y√1+(y)² dx

y=x³

y'=3x²

By rotating the curve y=x³ about the x axis in the interval [0,2]

s=2π∫₀²(x³)√1+(3x²)² dx

let u=1+9x⁴

du=36x³dx

dx/36x³

Substituting u and du in the integral,

s= 2π∫₀²(x³)√u du/36x³

s= 2π∫₀²√u du

s= 2π/36.2/3[u.3/2]₀²

s= π/27[(145)³/²-(1)³/²]

s= π/27 [1746.03-1]

s= π/27 [1745.03]

s= 64.67π

s= 64.67(3.14)

s=203.06 square units.

therefore, the exact surface area is 203.06 square units.

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Answer:

      In order to find the surface area obtained by rotating the curve we need to find surface area for rotation along x axis then substituting values in the integral.                       

                           

         Given:    y=3x, for x is in [1,125] about the y axis.

                                            y=x³ ,0≤x≤2

Lets find the surface area of the rotating curve,

Finding surface area for rotation along x-axis,

                                    s=2π∫ᵇₐ y√1+(y)² dx

                                     y=x³

                                     y'=3x²

By rotating the curve y=x³ about the x axis in the interval [0,2]

                           s=2π∫₀²(x³)√1+(3x²)² dx

                          Assuming  u =1+9x⁴

                                           du=36x³dx

                                               =dx/36x³

Substituting respective values of u and du in the integral,

                              s= 2π∫₀²(x³)√u du/36x³

                              s= 2π∫₀²√u du

                              s= 2π/36.2/3[u.3/2]₀²

                              s= π/27[(145)³/²-(1)³/²]

                              s= π/27 [1746.03-1]

                              s= π/27 [1745.03]

                              s= 64.67π

                              s= 64.67(3.14)

                              s=203.06 square units.

hence, the surface area is 203.06 square units.

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