Question $2(1\mathrm{.}9$ points$)$

${\displaystyle \underset{-4}{\overset{4}{}}}{\displaystyle \underset{0}{\overset{\sqrt[\phantom{2}]{16-y^2}}{}}}{\displaystyle \underset{0}{\overset{x^2+y^2}{}}}f(x,y,z)dzdxdy={\displaystyle \underset{{}_1}{\overset{{}_2}{}}}{\displaystyle \underset{r_1}{\overset{r_2}{}}}{\displaystyle \underset{z_1}{\overset{z_2}{}}}f(rcos,rsin,z)rdzdrd$