Question
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.
Answers
kuai
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
kuai
1 = k5sqrt(36)
21 = 30k
k = 21/30
a = (21/30)*b sqrt(c)
a = (21/30) *9 sqrt(225)
a = 189/2
21 = 30k
k = 21/30
a = (21/30)*b sqrt(c)
a = (21/30) *9 sqrt(225)
a = 189/2