Aone day movie rental at red box cost $1.39. for each additional day there is a fee of $0.50.how much will it cost to rent a movie for 7 days

C = 1.39 + 0.5(n - 1), where C is the cost and n is the number of days
C = 1.39 + 0.5(6)
C = $4.39

Hey there!

Let's first create an equation. We'll set out total, t, equal to our initial value times d, or days, for each additional day.

That means that we have 1.39 as our initial, upfront value. It's not affected by anything else, and is a one-time payment. For each additional day, we have to pay 50 cents, so to find our how much in a given day, we use:

t = 1.39 + .50d

We multiply the .50 times each day because every day, we pay 50 cents for each additional day.

Now, we can plug in 6 for d. We plug in 6 because we've already accounted for one day with that one-time initial value. We have:

t = 1.39 + .50(6)
t = 1.39 + 3
t = 4.39

Therefore, 7 days will cost $4.39

Hope this helps!