I need help please

Find the volume of the solid. A solid lies between planes perpendicular to the x-axis at x- 9 and x=9. The cross-sections perpendicular to the x-axis between these planes are squares whose bases run from the semicircle y = - 181 - x" to the semicircle y = 181-x2. The volutuc of the sold is cubic units. (Simplify your answer.)