The table below shows the number of days you keep a rented movie before returning it and the total cost of renting the movie. Find the rate of change in cost with respect to time and interpret its meaning.

Time (days) 4 5 6 7

Total cost (dollars) 6.00 8.25 10.50 12.75

a. Rate of Change:__

= (8.25 - 6.00)/(5 - 4) = 2.25

b. Interpret the rate of change (slope) in the context of this problem situation:

      Cost of renting movie per day = $ 2.25/day