= x² y = Problems "concern the region bounded by y = y=1, and the y-axis, for z≥0. Find the volume of the following solids. The solid obtained by rotating the region around the y- axis. The solid obtained by rotating the region about the line The solid whose base is the region and whose cross- sections perpendicular to the x-axis are semicircles. Find the volume of the solid obtained by rotating the re- gion bounded by y 4y, about the line x = 9. V,