Question

If r is directly proportional to the

square of s and r = 72 when
= 12, find r when s = 8.?

Answer 1

r2=48

Explanation:

r1=72

s1=12

s2=8

`r \alpha s \\ (r1)/(s1) = (r2)/(s2) \\ (72)/(12) = (r2)/(8) \\ r2 = 8 * (72)/(12) = 48`