Minus, I don't, I have to write a parentheses there. So we could write f of x squared minus g of x squared. And then if we want the volume, put that in that same yellow. If we want the volume of this thing, we just multiply it times the depth of each of those washers. So the volume of each of these washers are going to be pi times, pi times f of x, f of x squared minus g of x squared, the outer function squared over our interval minus our inner function squared over the interval, and then times our depth. Times our depth. That'd be the volume of each of these washers.