The circumference c of a circle may be expressed as a function of its radius r. given c=2πr, where 2π is a constant, express c as a function of r using f and find f(7), f(0.8), f(5/2). find the range of domain.

brainliest and 40 points

answer:

c = 2πr

1) divide both sides by 2π: r = c/(2π)

2) substitute 72π for c: r = 72π/(2π) = 36

3) a circle with circumference 72π has a radius 36.

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step-by-step explanation:

hopefully im right

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^