Find the volume of the following solids. The base of a solid is the region bounded by the graphs of y = 6x, y = 24, and x = 0. The cross-sections perpendicular to the x-axis are a. rectangles of height 10. b. rectangles of perimeter 100. a. V = b. V = (Type an exact answer, using radicals as needed.) (Type an exact answer, using radicals as needed.)