Chapter 15.5, Problem 24ES

Set up, but do not evaluate, two different iterated integrals equal to the given integral.

${\displaystyle \underset{\sigma }{\iint }{x}^{2}ydS,}$ where $\sigma$ is the portion of the cylinder $y^2+z^2=a^2$ in the first octant between the planes $x=0,x=9,\text{and}z=2y.$