It's bounded below by f of x, or 8x to the third. So the area is going to be, actually let me just do it, I'll scroll down a little bit. I still want to be able to see this graph right over here. Part b, the area of r is going to be equal to the integral from 0, that's this point of intersection right over here, to 1 half. So let me make it clear, this is 0 to 1 half. And then the function on the top, so we could just take the area of that, but then we're going to have to subtract from that the area underneath the function below. Or one way to think about it is, the integral from 0 to 1 half of the top function is g of x, which is sine of pi x.