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lorasvet [3.4K]
3 years ago
10

A(r) is a function that gives the area of a circle with radius r. It can be written in equation form as A(r)=3.14r2. What is the

values of A(5)?
Mathematics
1 answer:
GREYUIT [131]3 years ago
3 0
F(r) = 3.14r^2....and ur looking for f(5)....so basically all u do is sub in 5 for r.

f(5) = 3.14 * 5^2
f(5) = 3.14 * 25
f(5) = 78.50 <===

THE ANSWER IS 78.50

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Answer:

a. The y coordinates for A are either 10 or -14

b.  The y coordinates for A are either -11 or 7

Step-by-step explanation:

distance = sqrt ((x2-x1)^2+(y2-y1)^2)

We know Point B and the x coordinate of point A as well as the distance

15 = sqrt ((-4-5)^2+(-2-y1)^2)

15 = sqrt ((-9)^2+(-2-y1)^2)

15 = sqrt (81+(-2-y1)^2)

Square each side

15^2 =sqrt (81+(-2-y1)^2)^2

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225-81 = 81-81 +(-2-y1)^2

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Take the square root of each side

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Add 2 to each side

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2±12 = -y1

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Multiply by -1

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The y coordinates for A are either 10 or -14

Now move B to -7,-2

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15 = sqrt ((-12)^2+(-2-y1)^2)

15 = sqrt (144+(-2-y1)^2)

Square each side

15^2 =sqrt (144+(-2-y1)^2)^2

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Subtract 144 from each side

225-144 = 144-144 +(-2-y1)^2

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Take the square root of each side

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Add 2 to each side

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Multiply by -1

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The y coordinates for A are either -11 or 7

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