A retail store is having a sale on toilet paper. At 2:00PM, the store has sold 15 packs of toilet paper. At 5:00PM, the store discovers that it has sold 57 packs. What is the average rate of change between 2:00PM and 5:00PM?packs/hr
Average rate of change =(57packs-15 packs)/(5 hour-2 hour)= 14 packs per hour.