A1-day movie rental at red box costs $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?

Lets just simply solve:-

Days:-   1         2          3        4          5         6         7                                     
           1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 = Cost to rent a movie for 7 days. 

 1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 =  4.39

So, to rent a movie for 7 days it would cost $4.39.

Hope i helped ya!! 

1.39+.50+.50+.50+.50+.50+.50=$4.39 in 7 days

Yeah me i need badly