a.) Find the volume of the solid obtained by rotating the region enclosed by the graphs about the given axis. y = 2 x, y = x, about x =- 2 b) Use the Shell Method to compute the volume obtained by rotating the region enclosed by the graphs as indicated, about the y-axis. y = x , y= 8 - x, x = 0for x 2 0 c.) Use the shell method to set up (do not evaluate) an integral that calculates the volume of the solid obtained by rotating the region between the graphs of f(x) = x + 2andy = 1for 1