Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-If $\mathrm{f}$ varies jointly as $\mathrm{q}^{2}$ and $\mathrm{h}$ , and $\mathrm{f}=64$ when $\mathrm{q}=4$ and $\mathrm{h}=2$ , find $\mathrm{q}$ when $\mathrm{f}=90$ and $\mathrm{h}=5$ .

A) 4
B) 3
C) 2
D) 5