Since we have 2 x values given:
You would need to look into the graph.
As x = 0, y = -1
As x = 2, y = 5
We have 2 coordinate points now YAY!
(0, -1) and (2, 5)
we next find the slope..... using the slope formula if you recall (Hint:
)

3 is your average rate of change from x = 0 to x = 2
V = 3.14 (16)(5)
V = 251.2
answer
251.2 cubic inches