9800 ft by 11:00 A.M. etc!? Naomi Left from an elevation of 7400 ft at 7:00 A.M. & hiked to an elevation of 9800 ft by 11:00 A.M. What was her rate of change in altitude?


A machine that originally cost $15,600 has a value of $7500 at the end of 3 years. The same machine has a value of $2800 at the end of 8 years.

1] Find the average rate of change in value (depreciation) of the machine between its purchase and the end of 3 years.

2] Find the average rate of change in value of the machine between the end of 3 years and the end of 8 years.

3] Interpret the sign of your answers.