how to do these questions? HELP

[motocross53]

Integration: Volume of revolution

y = x^2 meets the line y =4 at the points P and Q, P and Q are equal to -2,4 and 2,4. Calculate the volume generated when the region bounded by the curve and the line is rotated through 360degrees about the x-axis?

and

The region bounded bu the lines y = x+1  , y=3 and the y-axis is rotated through 360degrees about the x-axis. Calculate the volume of the solid generated.

Thanks everyone .

[paulsterio]

forgot to multiply by pi, this is what happens when you don't do these for a few months, i'm gonna kick myself


so 256pi/5

[Planck's constant]

times pi

[paulsterio]

times pi

i'm too rusty D: