And so 4 times 48 is 160 plus 32, so it's 192. And then finally, this last trapezoid, its base is only 1. Its base right over here is only 1. 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.