I have a problem I'm working on for a study guide, but it's worded a little oddly compared to the other problems.

Set up the integral and find the volume of the bounded region with the washer/disc method.

15. Below by y=3x^2_1 and above by y=4, rotated about the line y=4.

It doesn't seem like it should be that hard, but again the wording is throwing me off. Any help would be much appreciated. The answer is (48pi/5). I just need to figure out how to get there.