4. a solid has as its base the region bounded by the curves y = -2x + 2 and y. -x2 + 1. find the
volume of the solid if every cross section of a plane perpendicular to the x-axis is a trapezoid
the length of the lower base, and height
with lower base in the xy-plane, upper base equal to
equal to 2 times the length of the lower base.