Asolid lies between planes perpendicular to the x-axis at xequals0 and xequals9. the cross-sections perpendicular to the axis on the interval 0less than or equalsxless than or equals9 are squares with diagonals that run from the parabola y equals negative 2 startroot x endroot to the parabola y equals 2 startroot x endroot. find the volume of the solid.