And then its height is 43 at the left side, 43 at the right side. So its average height is 43.5 times 1. So that's just going to be 43.5. And so if we add up the areas of all these trapezoids, we have a pretty good approximation for the definite integral. I'll just use the calculator for this part right over here. So we have 126 plus 168 plus 192 plus 43.5 gives us 529.5. So this is equal to 529.5.