please solve the problems

3. Find the volume of the solid that results when the region enclosed by the given curves is revolved about the x-axis: y = , x=1, x=4, and the x-axis. Assume length is measured in cm. Evaluate by hand and show all calculations. 4. Find the volume of the solid generated by revolving the region bounded by the graphs of x = y,y A . Y = 0 , and x = 4 about the line x = 8. 6 7