So that's the width right over there, and we know that that's going to be 15 over y. And then what's the height gonna be? Well, that's gonna be a very small change in y. The height is going to be dy. So the area of one of those little rectangles right over there, say the area of that one right over there, you could view as, let me do it over here, as 15 over y dy. And then we wanna sum all of these little rectangles from y is equal to e all the way to y is equal to e to the third power. So that's what our definite integral does.