9. Sketch the region bounded by y = m + 1; y = r + 4, a: = 0 and a: = 4. Use the washer method to determine the volume of the solid of revolution formed when this region is rotated around the xaxis. 10. Sketch the region bounded by y : and y : x2. Use the washer method to determine the volume of the solid of revolution formed when this region is rotated around the maxis