how can I solve such questions:

The region http://www.mathhelpforum.com/math-he...af1283d6-1.gif in the first quadrant is bounded by the y-axis, the line y=x and the curve http://www.mathhelpforum.com/math-he...ad89c140-1.gif. Calculate the volume formed when R is rotated about the y-axis through 1 revolution