Question $2$

Evaluate the following integral $by$ converting $to$ spherical coordinates first:

${\displaystyle \underset{0}{\overset{3}{}}}{\displaystyle \underset{-\sqrt[\phantom{2}]{9-z^2}}{\overset{\sqrt[\phantom{2}]{9-z^2}}{}}}{\displaystyle \underset{-\sqrt[\phantom{2}]{9-y^2-z^2}}{\overset{\sqrt[\phantom{2}]{9-y^2-z^2}}{}}}(x^2)dxdydz$