The quantity q varies inversely with the square of m and directly with the product of r and x. When q is 2.5, m is 4 and the product of r and x is 8. What is the constant of variation?

Answer 1

q = k(1/m^2)(rx)
plug in the given values

2.5 = k(1/16)(8)

solve for k

Answer 2

K=5