11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, and 28 Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer. 11. y=x+1, y = 0, x = 0, x = 2; about the x-axis SHOW ANSWER 12. y=1/x, y=0, x = 1, x = 4; about the x-axis 13. y = x1, y = 0, x = 5; about the x-axis SHOW ANSWER 14. y = /25 x, y=0, x = 2, x = 4; about the x-axis 15. x = 2y, x = 0, y = 9; about the y-axis