Finding the Volume of a Solid In Exercises 25-32, find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. 25. y = y = 0, x=0, x=2 3x + 5' 26. y = x4 -x2, y = 0 27. y = y = 0, x = 1, x=3 2 28. y = x + 1' y = 0, x = 0, x =6 29. y = e-3x, y = 0, x = 0, x =2