3 years ago

What is the radius of a circle that has circumference of 81pi square inches?

Mathematics

1 answer:

Troyanec [42]3 years ago

8 0

I think the answer is 18 in

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Dahasolnce [82]

Answer:

a. The constant = 45

b. The unit rate is 45 miles per hour

c. d = 45t

Step-by-step explanation:

a. ∵ d ∝ t

∴ d = kt

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∴ 90 = k(2)

∴ k = 90 ÷ 2 = 45

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b. ∵ k = d(miles) ÷ t(hours) = 45

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c. The equation is ⇒ d = 45t

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Step-by-step explanation:

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