I just randomly picked. So let's say y max is 1,500, and if for whatever reason our graph doesn't fit in there, then maybe we can make our y max even larger. So I think this is going to be a decent range. Now let's actually input the function itself. So our volume is equal to x times 20 minus 2x times 30 minus 2x. And that looks about right, so now I think we can graph it. So second, and I want to select that up there, so I'll do graph.