1. Missing equation

  2. Missing equation

  3. One cubic foot. The box should be a cube one foot on each side.

  4. There are three critical points -- at (-1, 0), (0, 0), and (1, 0).

    Missing graphic

    The critical point at (0, 0) looks like a saddle. The other two critical points are minimums.

Copyright c 1997 by Frank Wattenberg, Department of Mathematics, Montana State University, Bozeman, MT 59717