Disc Method: Revolving Around x/y Axes Practice Test

A region bounded by $y=\sqrt{4-x^2}$ and the x-axis for $-2\le x\le 2$ is revolved about the x-axis. Which integral gives the volume?

The region bounded by $x=3\sqrt{y}$ and the y-axis on $0\le y\le 4$ is revolved about the y-axis. Which integral gives the volume?