We can help you with parts 1 and 2 if you tell us where you're having difficulty. Assuming you've done parts 1 and 2 with no difficulty, in part 3 you can probably fit a quadratic curve (y = ax^2 + bx + c) to the given shape. You'll need to reserve one parameter for the size - you'll calculate that one after you integrate (so the volume is correct).

- Hollywood