1)Find the volume of the solid obtained by rotating the region enclosed by the graphs y=3x^4 and y=4,x0 about the y-axis

2)Find the volume V of the solid obtained by rotating the region bounded by the graphs y=1/x^2, y=0,x=1, x=4 about y=3.

3)Find the volume of a solid obtained by rotating the region bounded by the graphs y=e^x,y=0,x=0, and x=9 about y=4.

4)Find the volume of the solid obtained by rotating the region enclosed by the graphs y=8/x,y=3, and y=7,x0 about the y-axis