Disc Method: Revolving Around x/y Axes Practice Test

The region bounded by $x=e^y$ and the y-axis for $0 \le y \le 1$ is revolved about the y-axis; which integral represents the volume?

Revolve the region bounded by $y=\frac{x}{2}$ and the x-axis from $x=0$ to $x=4$ about the x-axis; select the correct integral.