So it'll be 3.92, 3.92. I'll just use this expression for the volume as a function of x. 3.92 times 20 minus two times 3.92 times 30, 30 minus two times 3.92 gives us, and we deserve a drum roll now, gives us 1,056.3. So 1,056.3, which is a higher volume than we got when we just inspected it graphically. We probably could have gotten a little bit more precise if we zoomed in some, and then we would have gotten a little bit better of an answer. But there you have it. Analytically, we were able to actually get an even better answer than we were able to do, at least on that first pass graphically.