Velocity of a Train The distance D in miles that a train is from a station after

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Velocity of a Train The distance D in miles that a train is from a station after x hours is given by the formula D(x) = 150 - 20x. 

(a) Calculate D(5) and interpret the result. 

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

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