Convert the integral from rectangular coordinates to both cylindrical and spherical coordinates

${\displaystyle \underset{-3}{\overset{3}{}}}{\displaystyle \underset{-\sqrt[\phantom{2}]{9-x^2}}{\overset{\sqrt[\phantom{2}]{9-x^2}}{}}}{\displaystyle \underset{x^2+y^2}{\overset{9}{}}}xdzdydx$

cylindrical:

${\displaystyle \underset{0}{\overset{\phantom{}}{}}}{\displaystyle \underset{0}{\overset{\phantom{}}{}}}{\displaystyle \underset{r^2}{\overset{\phantom{}}{}}}()dzdrd$

spherical:

Evaluate the simplest iterated integral.