Let P be the point (6,0), let Q be the point (0,4), and let R be the triangular region with with vertices at P, Q, and the origin.
1) Determine the volume of the solid of revolution formed when R is revolved about the x-axis.
2) Use the washer method (and no other method) to dertermine the volume of the solid of revolution formed when R is revolved about the line x=7.
3) Use the cylindrical shell method (and no other method) to dertermine the volume of the solid of revolution formed when R is revolved about the line x=7.