Or you could say that 10 is going to be greater than or equal to x, which is another way of saying that x is going to be less than or equal to 10. It's a different shade of yellow. x is going to be less than or equal to 10. So x has got to be between zero and 10. Otherwise, we've cut too much or we're somehow adding cardboard or something. So first let's think about the volume at the endpoints of our domain, of what x can be for our volume. Well, our volume when x is equal to zero is equal to what?