Washer Method: Revolving Around x/y Axes Practice Test

Which integral sets up the volume when the region between $y=x$ and $y=\tfrac{x}{2}$ on $0,4$ is revolved about the $x$-axis?

Which integral gives the volume when the region between $y=e^x$ and $y=1$ on $0,\ln 3$ is revolved about the $x$-axis?