${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}{x}^2\sqrt[\phantom{2}]{16-x^2}dx$

$1)$ Above$^^$

$2){\displaystyle \underset{0}{\overset{3\frac{\sqrt[\phantom{2}]{3}}{2}}{}}}\frac{x^3}{(4x^2+9{)}^{\frac{3}{2}}}dx$

$3)$ The region bounded by $y=\frac{1}{1+x^2},x=0,x=1,$ and $y=0$ is revolved around the $x-$axis. Find the volume of the solid generated.

$4)$ Find the area of the region bounded by $y=\frac{2}{\sqrt[\phantom{2}]{64-4x^2}},x=0,y=0,$ and $x=2.$