The function given by the formula fv w evw is an

Question

Question: 1. Sketch cross-sections of f(r, h) = πr2h, first keeping h fixed, then keeping r fixed.

2. The function given by the formula f(v, w) = e^v/w is an increasing function of v when w is a nonzero constant.

3. A function f(x, y) can be an increasing function of x with y held fixed, and be a decreasing function of y with x held fixed.