Plz help
Given a circle with measures of (C, d, and r) and a circle with measures of (C', d', and r'), find r' if C C' = 0.25 and d = 6.0. A) 6 B) 12 C) 18 D) 24

B) 12

Step-by-step explanation:

C is the circumference, d is the diameter, and r is the radius.  They are related by the following equations:

d = 2r

C = πd = 2πr

If d = 6.0, then r = 3.0.

If C / C' = 0.25, then:

(2πr) / (2πr') = 0.25

r / r' = 0.25

3 / r' = 0.25

r' = 12

a. she will receive a refund of $278.

step-by-step explanation:

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