Which of the following could not be the lengths of the sides of a right triangle?
2 9 ft, 12 ft, 15 ft
c 4 cm, 7.5 cm, 8.5 cm
b. sin., 10 in, 15 in
d 15 m, 2 m, 2.5 m

Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. y = x â’ 1 , y = 0, x = 5; about the x-axis v = sketch the region. sketch the solid, and a typical disk or washer.