395,203 views
37 votes
37 votes
If r is directly proportional to the

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

User Alec Menconi
by
2.7k points

1 Answer

16 votes
16 votes

Answer:

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

User Hugos
by
2.6k points
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