80. On a certain mountain, the elevation z above a point (x, y) in an xy-plane at sea level is z= 2000 - 0.02x -0.04y, where x, y, and z are in meters. The positive x-axis points east, and the positive y-axis north. A climber is at the point (-20, 5, 1991). (a) If the climber uses a compass reading to walk due west, will she begin to ascend or descend? (b) If the climber uses a compass reading to walk north- east, will she ascend or descend? At what rate? |3D 1 (c) In what compass direction should the climber begin walking to travel a level path (two answers)?

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