A driver's distance D in miles from a rest stop after / hours is given by D(t)

Question:

A driver's distance D in miles from a rest stop after / hours is given by D(t) = 280 - 70t.

(a) How far is the driver from the rest stop after 2 hours?

(b) Find the slope of the graph of D. Interpret this slope as a rate of change.

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