0is less than or equal to 2x - 10 is less than or equal to 20

Find the volume of the solid generated when the region bounded by y= x and y= 4√x is revolved about the x-axis the volume of the solid is: (type an exact answer cubic units)

For which pair of functions is (gof)(a)=|a|-2?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?