I took these questions out of my book to review. I am stuck on volume of solids.
Find the volume of the solid generated by revolving the shaded region around the x-axis.
1.About the x axis
y = 4 sec x
2. y = (x)^.5, y = 0, x=0, x=6
3. y= 1/x, y=0, x=1, x=5