5. Find the volume of the solid whose base is bounded by x = y and x = 4, whose cross sections taken perpendicular to the x-axis are equilateral triangles. [No calculator]6. Find the volume of the solid whose base is bounded by x = yz and x = 4, whose cross section taken perpendicular to the x-axis are triangles whose height is - the length of the base. [No calculator] 7. Find the volume of the solid whose base is bounded by x = y and x = 4, whose cross section taken perpendicular to the x-axis are trapezoids with a height h = 2 and the upper base is half the length of the lower base. [No calculator] Questions 8 - 9. Let the base of a solid be enclosed by the x-axis, the y-axis, and the graph of y = 2 - - x2. Find the volume of each solid for the given cross sections taken perpendicular to the y-axis. 8. Square 9. Semi-circle