8. Find the volume of the solid obtained by rotating the region under the graph of f (x) = 9 x for 0 < x < 3 about the vertical axis x = -2. 9. Sketch the region enclosed by the functions f (x) = x? + 2 and g(x) = 4- x2?. Find the volume obtained by rotating the region about the horizontal line y = -3. %3D