4. (a) (4 points) A solid is form by revolving the region bounded between the curves 3; = (:1: 2)2 and y = :I: about the line :L' = 1. Find the volume of the region. (b) (4 points) A solid is form by revolving the region bounded between the curves 3; = (:1: 2)2 and y 2 33 about the line y = 4. Find the volume of the region