Answer:
The volume ratio of Prism A to Prism B is [tex]\frac{729}{8}[/tex]
Step-by-step explanation:
Step 1
Find the scale factor
we know that
If two figures are similar, then the ratio of its surface areas is equal to the scale factor squared
Let
z-----> scale factor
x/y----> ratio of the surface area of Prism A to Prism B
so
[tex]z^{2}=\frac{x}{y}[/tex]
we have
[tex]\frac{x}{y}=\frac{81}{4}[/tex]
substitute
[tex]z^{2}=\frac{81}{4}[/tex]
[tex]z=\frac{9}{2}[/tex]
step 3
Find the volume ratio of Prism A to Prism B.
we know that
If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube
Let
z-----> scale factor
x/y----> volume ratio of Prism A to Prism B
so
[tex]z^{3}=\frac{x}{y}[/tex]
we have
[tex]z=\frac{9}{2}[/tex]
substitute
[tex](\frac{9}{2})^{3}=\frac{x}{y}[/tex]
[tex](\frac{729}{8})=\frac{x}{y}[/tex]
The volume ratio of two similar prisms with a surface area ratio of 81:4 is obtained by cubing the square root of the surface area ratio, resulting in a volume ratio of 729:8.
Explanation:The question involves finding the volume ratio of two similar prisms when the surface area ratio is given.
Since the surface areas are in a ratio of 81:4, the corresponding linear dimensions will be in the square root ratio, which is 9:2. For two similar three-dimensional shapes, if the ratio of their corresponding lengths is a:b, then the ratio of their surface areas is a^2:b^2, and the ratio of their volumes is a^3:b^3.
Therefore, the volume ratio of Prism A to Prism B can be found by cubing the linear dimension ratio: (9:2)^3 which equals 729:8. Hence, the volume ratio of Prism A to Prism B is 729:8.
Which of the following of the statement “if i like math, then i like science
Write the statement as an algebraic expression.
The sum of square of c and d increased by twice their product.
[tex]\boxed{c^2+d^2+2cd}[/tex]
Hope this helps.
r3t40
Find the value of y if angle 1 =2y+8
41° because it’s a right angle and if 90=2y+8, y=41
Answer:
41
Step-by-step explanation:
The city aquarium got a new tank for their dolphins. The tank is 16 feet high with a radius of 28 feet. Answer these questions about the new dolphin tank.
Approximately how much water will it take to fill the tank?
= 39,408.14 cubic feet (I know this answer just not the second one)
The aquarium needs to purchase a plastic cover for the tank. What should the approximate size of the cover be?
A) 50.27
B) 87.96
C) 804.25
D) 2,463.01
Answer:
This answer would be 2,463.01 "D"
Step-by-step explanation:
The approximate size of the cover will be 2463.01 square feet
What is a cylinder?'A cylinder is a three-dimensional solid that holds two parallel bases joined by a curved surface, at a fixed distance.'
According to the given problem,
The size of the cover of the tank = area of the circle of the tank (approximately)
r = 28 feet
Area of the circle = [tex]\pi r^{2}[/tex]
= [tex]\pi *28^{2}[/tex]
= [tex]2463.01[/tex]
Hence, we have concluded that in order to cover the tank, which is a circular area, the area of the cover has to be approximately 2463.01 square feet.
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Which ratio is equivalent to 9/36
Answer:
1/4
Step-by-step explanation:
Step 1: Find the GCF. List out the factors of the numerator and the denominator. 1, 3, 9 are the factors of 9, while 1, 2, 3, 4, 6, 9, 12, 18, and 36 are the factors of 36. 9 is a common factor of both of them, so the GCF is 9.
Step 2: Divide the numerator and denominator by 9 (the GCF). 9/9 is 1. 36/9 is 4. This means that our fraction is 1/4. The fraction is in simplest form.
Which of the following are not trigonometric identities? Check all that apply. A. tan^2x+sec^2x=1. B. sin^2x+cos^2x=1. C. sec^2x-tan^2x=1. D. sec^2x+csc^2x=1.
Answer:
a
Step-by-step explanation:
Answer:
Option (A) and (D) are not trigonometric identities.
Step-by-step explanation:
Option (A ) tan²x + sec²x = 1
Since [tex]tanx =\frac{sinx}{cosx}[/tex] and [tex]secx =\frac{1}{cosx}[/tex]
put these in left hand side of tan²x + sec²x = 1
[tex](\frac{sinx}{cosx})^{2}[/tex] + [tex](\frac{1}{cosx})^{2}[/tex]
[tex](\frac{sin^{2}x}{cos^{2}x})[/tex] + [tex](\frac{1}{cos^{2}x})[/tex]
Take L.C.M of above expression,
[tex](\frac{sin^{2}x + 1}{cos^{2}x})[/tex]
since, sin²x = 1 - cos²x
[tex](\frac{1-cos^{2}x+1}{cos^{2}x})[/tex]
[tex](\frac{2-cos^{2}x}{cos^{2}x})[/tex]
we are not getting 1
so, this is not a trigonometric identity.
Option (A) is correct option
Option (B) sin²x + cos²x = 1
This is an trigonometric identity
Option (C) sec²x - tan²x = 1
Divide the trigonometric identity sin²x + cos²x = 1 both the sides by cos²x so, we get
[tex]\frac{sin^{2}x}{cos^{2}x}+\frac{cos^{2}x}{cos^{2}x}\,=\,\frac{1}{cos^{2}x}[/tex]
[tex]tan^{2}x}+1\,=\,sec^{2}x}[/tex]
subtract both the sides by tan²x in above expression
[tex]tan^{2}x}+1\,-tan^{2}x=\,sec^{2}x-tan^{2}x[/tex]
[tex]1=\,sec^{2}x}-tan^{2}x[/tex]
Hence, this is the trigonometric identity.
Option (D) sec²x + cosec²x = 1
Since [tex]secx =\frac{1}{cosx}[/tex] and [tex]cosecx =\frac{1}{sinx}[/tex]
put these in left hand side of sec²x + cosec²x = 1
[tex](\frac{1}{cosx})^{2}+(\frac{1}{sinx})^{2}[/tex]
[tex]\frac{1}{cos^{2}x}+\frac{1}{sin^{2}x}[/tex]
we are not getting 1
so, this is not a trigonometric identity.
Option (D) is correct option.
Hence, Option (A) and (D) are not trigonometric identities.
5. Two similar figures have volumes 27 in.? and 125 in.?. The surface area of the smaller figure is 63 in.. (1 point)
Find the surface area of the larger figure.
O105 in.?
О 136 in.?
О 175 in.?
О292in 2
Answer:
[tex]175\ in^{2}[/tex]
Step-by-step explanation:
step 1
Find the scale factor
we know that
If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube
Let
z----> the scale factor
x----> volume of the larger solid
y----> volume of the smaller solid
[tex]z^{3}=\frac{x}{y}[/tex]
we have
[tex]x=125\ in^{3}[/tex]
[tex]y=27\ in^{3}[/tex]
substitute
[tex]z^{3}=\frac{125}{27}[/tex]
[tex]z=\frac{5}{3}[/tex]
step 2
Find the surface area of the larger solid
we know that
If two figures are similar, then the ratio of its surface areas is equal to the scale factor squared
Let
z----> the scale factor
x----> surface area of the larger solid
y----> surface area of the smaller solid
[tex]z^{2}=\frac{x}{y}[/tex]
we have
[tex]z=\frac{5}{3}[/tex]
[tex]y=63\ in^{2}[/tex]
substitute
[tex](\frac{5}{3})^{2}=\frac{x}{63}[/tex]
[tex]x=\frac{25}{9}*63=175\ in^{2}[/tex]
Callie made a postcard that is 5 inches tall and 7 inches wide. A company wants to make a poster based on the postcard. The poster will be 2 feet tall. How wide will the poster be?
Answer:
It will be 2 feet and 9.6 inches wide
Step-by-step explanation:
First you divide 24 inches(2 feet) by 5 inches to find out the rate unit rate of change. Your answer would be 4.8. Then you multiply 4.8 by 7 to figure out how wide it would be, which gives you 33.6 inches(or 2 feet and 9.6 inches)
solve the following equation algebraically x^2=50
To solve the equation[tex]\(x^2 = 50\),[/tex] we'll take the square root of both sides. However, when we do this, we need to consider both the positive and negative square roots:
[tex]\[ x = \pm \sqrt{50} \]\[ x = \pm \sqrt{25 \cdot 2} \]\[ x = \pm 5\sqrt{2} \]So, the solutions to the equation \(x^2 = 50\) are \(x = 5\sqrt{2}\) and \(x = -5\sqrt{2}\).[/tex]
To solve the equation [tex]\(x^2 = 50\),[/tex]we'll take the square root of both sides. Remembering that the square root of a number has both positive and negative solutions, we have:
[tex]\[ x = \pm \sqrt{50} \]\[ x = \pm \sqrt{25 \cdot 2} \]\[ x = \pm 5\sqrt{2} \][/tex]
Therefore, the solutions to the equation[tex]\(x^2 = 50\) are \(x = 5\sqrt{2}\) and \(x = -5\sqrt{2}\). This means that when \(x\) is equal to either \(5\sqrt{2}\) or \(-5\sqrt{2}\), \(x^2\) will be equal to 50. These solutions represent the values of \(x\)[/tex]that satisfy the original equation and make it true.
Find the volume of the shaded area.
(15 POINTS)
(please help me)
Answer:
439cor.to 3 Sig. fig.
Step-by-step explanation:
(5+12)×6×14-(5÷2)²π×14
Ravi has 214 meters of rope. He gives 93 centimeters of the rope to his brother. How much rope does he have left?
A. 112
B. 125
C. 132
D. 148
After giving 93 centimeters (which is 0.93 meters) of his 214 meters of rope to his brother, Ravi has 213.07 meters of rope left.
Explanation:This question involves the concept of subtraction in the measurement unit of meters and centimeters. Initially, Ravi has 214 meters of rope. If he gives 93 centimeters of rope to his brother, keep in mind that 1 meter equals 100 centimeters. So, 93 centimeters is equal to 0.93 meters.
So, to find out how much rope Ravi is left with, you subtract the amount he gave to his brother from the original amount he had: 214 meters - 0.93 meters = 213.07 meters. This is the amount of rope Ravi has left after giving some to his brother.
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Can someone help, me with this geometry problem
Answer:
156.25% increase (56.25% added)
Step-by-step explanation:
Area formula of circle: A = πr²
1. Area when rope = 20 ft:
Plug in: A = π(20)²
Multiply: A = 400π ft²
2. Area when rope = 25 ft:
Plug in: A = π(25)²
Multiply: A = 625 ft²
3. Percent increase:
Increase compared to original: 625/400 = 1.5625 = 156.25%
Answer:
56.25%
Step-by-step explanation:
We are given that a horse is tethered on a 20 ft rope. If the rope is lengthened to 25 ft, we are to percentage by which its grazing area increases.
Grazing area with 20 ft rope = [tex]\pi \times 20^2[/tex] = [tex]400\pi[/tex]
Grazing area with 25 ft rope = [tex]\pi \times 25^2[/tex] = [tex]625\pi[/tex]
Percentage by which area increases = [tex] \frac { 6 2 5 \pi - 400 \pi } { 400 \pi } \times 100 [/tex] = 56.25%
9. What is the distance between (5, –2) and (5, 3)?
A. 5 units
B. –5 units
C. 3 units
D. 1 unit
Answer:
The correct answer is option A. 5 units
Step-by-step explanation:
Points to remember
Distance formula
Length of a line segment with end points (x1, y1) and (x2, y2) is given by,
Distance = √[(x2 - x1)² + (y2 - y1)²]
It is given that, two points are
(5, –2) and (5, 3)
To find the distance
(x1, y1) = (5, -2) and (x2, y2) = (5, 3)
Distance = √[(x2 - x1)² + (y2 - y1)²]
= √[(5 - 5)² + (3 - -2)²]
= √[(5)² = 5
Therefore the correct option is Option A 5 units
ABC has vertices A(-4, 4), B(6, 0), and C(-4, 0). Is ABC a right triangle?
Check the picture below.
Answer:
It's a Right Triangle
If the diameter of a circle is 6 Inches, what is the area?
if the diameter is 6 units, then the radius is half that, or 3.
[tex]\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} r=3 \end{cases}\implies A=\pi 3^2\implies A=9\pi \implies A\approx 28.27[/tex]
Final answer:
To calculate the area of a circle with a 6-inch diameter, use the radius (3 inches) in the area formula πr² to get an approximate area of 28.274 square inches.
Explanation:
To find the area of a circle with a diameter of 6 inches, we use the formula for the area of a circle, which is πr², where r is the radius of the circle. Since the diameter is 6 inches, we divide by two to find the radius (r = diameter / 2 = 6 / 2 = 3 inches).
Substituting the radius into the formula gives us π(3²) = π(9), and using the approximation π ≈ 3.14159, we find the area to be approximately 28.274 square inches.
the volume of a box is 10000 cm cube. the base is 25cm by 10 cm how tall is the box?
Answer:
40cm
Step-by-step explanation:
1. 10000cm^3/25cm= 400cm^2
2. 400cm^2/10 cm= 40cm
Final answer:
To find the height of the box, divide the volume of the box by the area of the base. In this case, the height is 40 cm.
Explanation:
To find the height of the box, we need to divide the volume of the box by the area of the base. The volume is given as 10000 cm³ and the base has dimensions 25 cm by 10 cm. So, the area of the base is 25 cm * 10 cm = 250 cm². Now, we can find the height by dividing the volume by the area: Height = Volume / Area = 10000 cm³ / 250 cm² = 40 cm.
Factor the polynomial by grouping
Answer:
D. [tex](x-2y)(x-y)(x+y)[/tex]
Step-by-step explanation:
In the polynomial [tex]x^3-2x^2y-xy^2+2y^3[/tex] group first two terms and second two terms:
[tex](x^3-2x^2y)+(-xy^2+2y^3)[/tex]
First two terms have common factor [tex]x^2[/tex] and last two terms have common factor [tex]y^2,[/tex] hence
[tex](x^3-2x^2y)+(-xy^2+2y^3)=x^2(x-2y)+y^2(-x+2y)[/tex]
In brackets you can see similar expressions that differ by sign, so
[tex]x^2(x-2y)+y^2(-x+2y)=x^2(x-2y)-y^2(x-2y)=(x-2y)(x^2-y^2)[/tex]
Now use formula
[tex]a^2-b^2=(a-b)(a+b)[/tex]
You get
[tex](x-2y)(x^2-y^2)=(x-2y)(x-y)(x+y)[/tex]
As part of the proof, find the midpoint of PR
Answer:
(b, c)
Step-by-step explanation:
The mid-point of two vertices or point is calculated by adding the respective coordinates of those points and then dividing by two. The x-coordinates will be added and then divided by 2 and then y-coordinates will be added and divided by 2.
So for the given question,
P(0,0)
Q(2a,0)
And
R(2b, 2c)
Mid-point of PR =( (0+2b)/2, (0+2c)/2)
=(2b/2, 2c/2)
=(b,c)
So the mid-point of PR is (b, c)
Last option is the correct answer..
how many terms are in the expression
[tex] {x}^{2} + xy - {y}^{2} + 5[/tex]
a term will be the expression between the + or - signs
[tex]\bf \stackrel{\stackrel{one}{\downarrow }}{x^2}+\stackrel{\stackrel{two}{\downarrow }}{xy}-\stackrel{\stackrel{three}{\downarrow }}{y^2}+\stackrel{\stackrel{four}{\downarrow }}{5}[/tex]
One number exceeds another number by 18. Find the numbers if the result of adding their sum and their product is a minimum.
Answer:
8
Step-by-step explanation:
The number is a, another number is b.
a = b + 18 So, b=a - 18
(a+b) + ab
= a + a - 18 + a (a - 18)
= 2a - 18 + a^2 - 18a
{ ax^2 + bx + c }
= a^2 -1 6a - 18 {a = 1b = -16 }
When a = b/-2a = -16/-2*1 = 8
the a^2 - 1ba - 18 is minimum,
So the number is 8
What is the vertical asymptote of this function?
Answer:
D
Step-by-step explanation:
If y = log x is the basic function, let's see the transformation rule(s):
Then,
1. y = log (x-a) is the original shifted a units to the right.
2. y = log x + b is the original shifted b units up
Hence, from the equation, we can say that this graph is:
** 2 units shifted right (with respect to original), and
** 10 units shifted up (with respect to original)
only, left or right shift affects vertical asymptotes.
Since, the graph of y = log x has x = 0 as the vertical asymptote and the transformed graph is shifted 2 units right (to x = 2), x = 2 is the new vertical asymptote.
Answer choice D is right.
How much money Anil should invest which will give him an interest of ₹1512 in 4 1⁄2 years at 3 1⁄2 % per annum simple interest?
Answer:
₹[tex]9,600[/tex]
Step-by-step explanation:
we know that
The simple interest formula is equal to
[tex]I=P(rt)[/tex]
where
I is the amount interest Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have
[tex]t=4.5\ years\\ P=?\\ I=1,512\\r=0.035[/tex]
substitute in the formula above
[tex]1,512=P(0.035*4.5)[/tex]
[tex]P=1,512/(0.035*4.5)=9,600[/tex]
solve 5x-97>-34 or 2x+31<29
I'll do both.
[tex]
5x-97>-34\Rightarrow x>\frac{-34+97}{5}=\frac{63}{5}=\boxed{12.6} \\
\boxed{x\in(12.6, \infty)} \\ \\
2x+31<29\Longrightarrow x<29-31=\boxed{-2} \\
\boxed{x\in(-\infty, -2)}
[/tex]
Please help me please
Answer: circumference: 22π area: 121π
Step-by-step explanation:
area of a circle is [tex]\pi r^2[/tex]
circumference is [tex]2\pi r[/tex]
A farmer fills his field proportionately with soybeans and corn. Last year he planted 200 acres of corn and 50 acres of soybeans. Answer these questions in the textbox or upload your work.
a) Are the number of acres of corn and the number of acres of soybeans directly proportional or inversely proportional? Explain your answer.
b) What is the constant of proportionality? Tell how you found it.
c) Let x equal the number of acres of corn and y equal the number of acres of soybeans. Write an equation to show this relationship.
d) How many acres of soybeans can the farmer plant this year if he plants 250 acres of corn? Show your work.
Answer:
Part A) Is a directly proportional
Part B) The constant of proportionality is [tex]k=0.25[/tex]
Part C) The equation is [tex]y=0.25x[/tex]
Part D) [tex]62.5[/tex] acres of soybeans
Step-by-step explanation:
Part A) Are the number of acres of corn and the number of acres of soybeans directly proportional or inversely proportional?
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form [tex]y/x=k[/tex]
Let
x-----> the number of acres of corn
y----> the number of acres of soybeans
so
[tex]y/x=k[/tex]
if the number of acres of corn increases then the number of acres of soybeans increases
if the number of acres of corn decreases then the number of acres of soybeans decreases
therefore
The relationship is a directly proportional
Part B) What is the constant of proportionality?
we have that
For x=200, y=50
substitute
[tex]y/x=k[/tex]
[tex]k=50/200[/tex]
[tex]k=0.25[/tex]
Part C) Let x equal the number of acres of corn and y equal the number of acres of soybeans. Write an equation to show this relationship.
The linear equation that represent the direct variation is equal to
[tex]y/x=k[/tex]
we have
[tex]k=0.25[/tex]
substitute
[tex]y/x=0.25[/tex]
[tex]y=0.25x[/tex]
Part D) How many acres of soybeans can the farmer plant this year if he plants 250 acres of corn?
For x=250
Find the value of y
substitute in the linear equation the value of x and solve for y
[tex]y=0.25(250)=62.5[/tex] -----> acres of soybeans
What is the lateral area of the cone to the nearest whole number? The figure is not drawn to scale. Helppp which one is it
It would be 49,009 because LA of a cone is height (50) times the radius (120) and that equals about 49,009.
Answer:
48984 m^2
Step-by-step explanation:
The height(h) of cone is given by: 50 m.
Diameter of cone is: 240 m.
Also radius(r) of cone is:240/2=120 m.
condense 2log4 + log3 - log2 + log5
[tex]2\log4 + \log3 -\log2 + \log5= \\ \\ = \log 2^4+ \log3 -\log2 + \log5 = \\ \\ = \log 16+ \log3 -\log2 + \log5 = \\ \\ = \log\Big(16\cdot 3:2\cdot 5\Big) = \log\Big(\dfrac{16\cdot 3\cdot 5}{2}\Big) = \log(8\cdot 3\cdot 5) = \\ \\ =\log120[/tex]
An individual head of a sprinkler system covers a circular area of grass with a radius of 25 feet. The yard has 3 sprinkler heads that each cover a circular area with no overlap. What is the approximate total area that will be watered?
1963.5 ft
1963.5 ft²
5890.5 ft
5890.5 ft²
Answer:
[tex]5,890.5\ ft^{2}[/tex]
Step-by-step explanation:
step 1
Find the area that cover each individual head of a sprinkler system
The area of the circle is equal to
[tex]A=\pi r^{2}[/tex]
we have
[tex]r=25\ ft[/tex]
assume
[tex]\pi=3.1416[/tex]
substitute
[tex]A=(3.1416)(25)^{2}[/tex]
[tex]A=1,963.5\ ft^{2}[/tex]
step 2
Find the area that covers 3 sprinkler heads
[tex](3)*1,963.5=5,890.5\ ft^{2}[/tex]
Answer:
5890.5 ft²
Step-by-step explanation:
did it on edg
Using the transformation T: (x, y) (x + 2, y + 1), find the distance named. Find the distance C'B'
Answer:
∴The distance CA = = 2√2
Step-by-step explanation:
Find the distance CA:
The distance between two points (x₁,y₁),(x₂,y₂) = d
The coordinates of point C = (-2,2)
The coordinates of point A = (0,0)
The distance CA distance between C and A
∴The distance CA = = 2√2
The distance[tex]\( C'B' \) is \( \sqrt{10} \)[/tex] units.
after applying the transformation[tex]\( T: (x, y) \rightarrow (x + 2, y + 1) \)[/tex], the distance between points [tex]\( C' \)[/tex] and [tex]\( B' \)[/tex] is [tex]\( \sqrt{10} \)[/tex] units.
The distance [tex]\( C'B' \)[/tex] is [tex]\( \sqrt{10} \)[/tex] units.
To find the distance [tex]\( C'B' \)[/tex], we first need to find the coordinates of points [tex]\( C' \)[/tex] and [tex]\( B' \)[/tex] after applying the transformation [tex]\( T: (x, y) \rightarrow (x + 2, y + 1) \) to points \( C \)[/tex] and [tex]\( B \).[/tex]
Given the coordinates of [tex]\( C \)[/tex] and [tex]\( B \)[/tex] as[tex]\( C(1, 2) \)[/tex] and [tex]\( B(4, 3) \)[/tex] respectively, we apply the transformation to each point:
For point [tex]\( C \):[/tex]
[tex]\[ C'(x', y') = (x + 2, y + 1) = (1 + 2, 2 + 1) = (3, 3) \][/tex]
For point [tex]\( B \):[/tex]
[tex]\[ B'(x', y') = (x + 2, y + 1) = (4 + 2, 3 + 1) = (6, 4) \][/tex]
Now, we use the distance formula to find the distance between [tex]\( C' \)[/tex]and [tex]\( B' \):[/tex]
[tex]\[ C'B' = \sqrt{(x'_2 - x'_1)^2 + (y'_2 - y'_1)^2} \][/tex]
[tex]\[ C'B' = \sqrt{(6 - 3)^2 + (4 - 3)^2} \][/tex]
[tex]\[ C'B' = \sqrt{(3)^2 + (1)^2} \][/tex]
[tex]\[ C'B' = \sqrt{9 + 1} \][/tex]
[tex]\[ C'B' = \sqrt{10} \][/tex]
Thus, the distance [tex]\( C'B' \)[/tex] is[tex]\( \sqrt{10} \)[/tex] units.
In conclusion, after applying the transformation [tex]\( T: (x, y) \rightarrow (x + 2, y + 1) \)[/tex], the distance between points [tex]\( C' \)[/tex] and [tex]\( B' \)[/tex] is [tex]\( \sqrt{10} \)[/tex] units.
Complete question
Using the transformation T: (x, y) (x + 2, y + 1), find the distance named. Find the distance C'B’
Question is shown below ↓
[tex]\bf \stackrel{\textit{using the exponential model}}{N=2^D}~\hspace{7em}\begin{array}{ccll} \stackrel{days}{D}&\stackrel{\$}{N}\\ \cline{1-2} 1&2^1\implies 2\\ 2&2^2\implies 4 \end{array}[/tex]
so, using that exponential model, the 1st output value works, but the second value of 2² does not give us 8 as output.
let's check the linear model using slopes to get the equation.
[tex]\bf (\stackrel{x_1}{1}~,~\stackrel{y_1}{2})\qquad (\stackrel{x_2}{2}~,~\stackrel{y_2}{8})\qquad \impliedby \begin{array}{|cc|ll} \cline{1-2} D&N\\ \cline{1-2} 1&2\\ 2&8\\ \cline{1-2} \end{array}[/tex]
[tex]\bf slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{8-2}{2-1}\implies \cfrac{6}{1}\implies 6 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-2=6(x-1) \\\\\\ y-2=6x-6\implies y=6x-4[/tex]
now, using that model, x = 6, then y = 6(6) - 4, or y = 32.