Diving for treasure. A treasure-hunting team of divers is placed in a computer-controlled...

Diving for treasure. A treasure-hunting team of divers is placed in a computer-controlled diving cage. The equation  describes the depth d (in feet) that the cage will descend in t minutes.

a. Sketch the graph of the equation d = – t – 9 t.

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b. What part of the graph represents the physical aspects of the problem?

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c. What is the total time of the entire diving experiment?