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12. [-/4 Points] DETAILS SESSCALCET2 7.3.001. Let S be the solid obtained by rotating the region shown in the figure about the y-axis. (Assume a = 10 and b = 2.) y = ax(x - by Sketch a typical approximation shell. 300 200 10 100 2 6 - X -100 10 1.0 1.5 . . -200 2.0 X -S 2.5 300 -10 A 14 300 12 10 200 100 6 -10 10 O -2 What are its circumference c and height h? c(x) = h(x) Use shells to find the volume V of S. V=