13.A machine that originally cost $15,600 has a value of $7,500 at the end of 3 years. The same machine has a value of $2,800 at the end of 8 years. a. Find the average rate of change in the value of the machine between its purchase and the end of 3 years. Work Solution b. Find the average rate of change in the value of the machine between the end of 3 years and the end of 8 years. Work Solution C. Interpret the sign of your answers. Solution

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