4) (19 points) Use Disk Method or Washer Method (for all parts) set up an integral to find the volume of the solid obtained by rotating the region bounded by y = x-5, x = 9, and y = 0 about 2 a. the x-axis. (Set up the integral to find the volume, but do not evaluate the integral) b. the line y = 7. (Set up the integral to find the volume, but do not evaluate the integral) c. the y-axis. (Set up the integral to find the volume, but do not evaluate the integral) d. the line x = 10. (Set up the integral to find the volume, but do not evaluate the integral)