1. (20 pts) Use the disk method or the shell method to find the volumes of the solids generated by revolving the region bounded by the graphs of the equations about the given lines. 10 72 ' y = 0, x = 1, x = 5 a) (5 pts) The x-axis b) (5 pts) The y-axis c) (5 pts) The line y = 10 d) (5 pts) The line x = 8