So I already had a tutor on campus try and run this question for me as I am very stuck and she sent me her work and its still wrong. I also received a (different) wrong answer when I tried posting it on chegg. I cant figure out where im messing up and after several house...apparently neither can anyone else. so any extra info would be GREATLY appreciated. Thanks!

The base of a solid is the area enclosed by y = 3x2, x = l, and y = 0. Find the volume of the solid if slices made perpendicular to the x-axis are semicircles. (Express numbers in exact form. Use symbolic notation and fractions where needed.) Incorrect