A solid is obtained by rotating the shaded region about the specified line. about the x-axis у 6 5 4 y=√x 31 3 y = 20 - x 2 X 5 10 15 20 25 i (a) Set up an integral using the method of cylindrical shells for the volume of the solid. M V = 2ny [ dy (b) Evaluate the integral to find the volume of the solid.