So get the calculator back out. And I could use, it's obviously roughly 3.92, I could use this exact value. Actually, let's, well, I'll just use 3.92 to get a rough sense of what our maximum value is, our maximum volume. 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.