Consider the region in the xy plane bound by the curves x = 2, x = 4, y = 0 and y = x. (a) Set up (but do NOT evaluate) an integral for the volume of the solid that is obtained when this region is rotated about the line x = 1 using the Washer method. (b)) Set up (but do NOT evaluate) an integral for the volume of the solid that is obtained when this region is rotated about the line x = 1 using the Shell method