Please help me in Calculus 2 (Finding Volume using Washer and Shell Method)

calculate the volume of the solid produced by rotating a plane region around an axis.

1.y=4xx2,x=0,y=4 revolved at y axis

2.y=7x,y=0,x=0, revolved at x axis

3. y=9x2,y=0, revolved at y axis

4.y=x8,y=256,yaxis, revolved at y axis

5.y=x,x=0,y=2, revolved at y axis