Hi...I'm working on a problem for the minimization of materials for a can. This juice can should hold 163 mL, and I'm already stuck on the first step. When setting up the minimization equation I should be able to graph it and get an idea of about where the minimum should be. I've got 2*Pi*r^2 + 326/r so far, but the graph doesn't show anything that looks like a zero slope anywhere - it just looks like a standard sqrt function. So before I go further with this, what am I doing wrong?