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if r varies directly as s and inversely as the square of u, and r=20 when s=5 and u=3, find r when u=5 and s=9?​

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LHELHENGIN

Answer:

if r varies directly as s and inversely as the square of u, and r=20 when s=5 and u=3, find r when u=5 and s=9

r = ks/u^2

20 = k(5)

(3)^2

k5 = (20)(9)

k5 = 180

k = 180

5

k = 36

r = (36)(9)

(5)^2

r = 324

25

r = 12.96

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