Solve the problem.The value, in dollars, of a copy machine is given by the function 
where x is the number of years that have passed since the machine was purchased. Interpret the slope of the graph of f as a rate of change.
A. The copy machine increases in value by $210 each year.
B. The copy machine increases in value by $420 each year.
C. The copy machine decreases in value by $210 each year.
D. The copy machine decreases in value by $420 each year.
Answer: D
Mathematics
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