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I have posted a link there to this topic so the OP can see my work.Calculus Question-disk/washer method?

a)Let R be the region bounded by the given curves. Sketch R on a graph. If R is revolved around the x-axis, find the volume of the solid revolution by the disk/washer method.

y=x^3

y=2x

b)Let R be the region bounded by the given curves. Sketch R on a graph. IF R is revolved around the y-axis find the volume of the solid revolution by the disk/washer method.

y=x^2+5

y=3

x=-2

x=2