20. Let S be the closed region in the first quadrant of the xy-plane bounded by y = 6x2, y = 0, x = 0, and x = 1. What is the volume of the solid obtained by revolving S about the line x = -1?
A. 3x B. 7x C. 36x /5
D. 8x E. 56x /5
The Volume of a Solid of Revolution is found.