a)Determine the volume of the solid obtained by revolving the area bounded by y = x^4 and y = x around the x-axis.

b) Set up an improper integral to express the volume of the solid obtained by rotating the area under y = 1/x , above the x-axis, and to the right of x = 5 around the x-axis. Does this integral converge? Is so, is the volume of this solid more or less than the volume of the solid you found in (a)