What is the length of leg s of the triangle below?

Iam so stuck. what is the worked out answer for this question?

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)

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4