Donnie is considering two different dvd rental stores both of which have a one time membership fee and a fee per rented dvd. the cost for the renting dvds at the first store is shown
the cost for renting dvd’s at the second store is modeled by the linear function c=5+2d where d is the number of dvds rented and c is the cost.

compare the rates of change for each function and explain what this means in terms of context.