This is trapezoid 4 right over here. So plus f of 4 plus f of 5, all of that over 2 times delta x. And then we have our last trapezoid, which I will do in yellow. So this is trapezoid number 5. Scroll down a little bit, get some more real estate. So it's going to be plus, I'll just write the plus over here, plus f of 5 plus f of 6 over 2 times our delta x. So let's see how we can simplify this a little bit.