A solid lies between planes perpendicular to the x-axis at x=0 and x=19. The cross sections perpendicular to the x-axis on the interval 0(less that or equal to)x(less than or equal to)15 are squares with diagonals that run from the parabola y=-2sqrt(x) to the parabola y=-2√x to the parabola y=2√x. Find the volume of the solid.