If a varies jointly as b and the square root of c, and a = 21 when b = 5 and c = 36, find a when b = 9 and c = 225.

2 answers

a = kbsqrt(c)

21 = k5sqrt936)

21 = 30k

k = 21/30

a = (21/30)*b sqrt(c)

a = (21/30) *9 8sqrt(2250

a = 189/2
1 = k5sqrt(36)

21 = 30k

k = 21/30

a = (21/30)*b sqrt(c)

a = (21/30) *9 sqrt(225)

a = 189/2
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