Well, our volume when x is equal to zero is equal to what? We're going to have zero times all of this stuff, and it's pretty obvious. You're not going to have any height here, so you're not going to have any volume, so our volume would be zero. What is our volume when x is equal to 10? Well, if x equaled 10, then the width here that I've drawn in pink would be zero. So once again, we would have no volume. And this term right over here, if we just look at it algebraically, would also be equal to zero, so this whole thing would be equal to zero.