Use the Disk$/$Washer method for all exercises!

Them region $R$ is bounded by $y=x^2$ and $y=2x.$ Set up integrals $($but do not evaluate$)$ for the volume of the solid of revolution obtained by revolving the region $R$

$($a$)$ around the $x-$axis.

$($b$)$ around the line $y=5.$

$($c$)$ around the $Y-$axis.

$($d$)$ around the line $x=-3$