Determine the Constant of Variation for the Stated Condition $q ^ { 2 }$

Multiple Choice

Determine the constant of variation for the stated condition.
-f varies jointly as $q ^ { 2 }$ and $h$ , and $f = 64$ when $q = 4$ and $h = 2$ . Find $q$ when $f = 90$ and $h = 5$ .

A) $q = 3$
B) $q = 2$
C) $\mathrm { q } = 4$
D) $q = 5$ q