SOLUTION: 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. HINT: A=kB√C

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 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. HINT: A=kB√C      Log On


   

Question 1170951: 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.
HINT: A=kB√C
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
A=kBsqrt%28C%29
A+=+21 when B+=+5 and C+=+36
21=k%2A5sqrt%2836%29
21=k%2A5%2A6
21=k%2A30...divide by 3
7=k%2A10
k=7%2F10


A=%287%2F10%29Bsqrt%28C%29

find A when+B+=+9 and C+=+225

A=%287%2F10%29%2A9%2Asqrt%28225%29
A=%287%2F10%29%2A9%2A15
A=%287%2Fcross%2810%292%29%2A9%2Across%2815%293
A=%287%2F2%29%2A9%2A3+
A=189%2F2++
A=94.5