Renting a movie from a redbox costs $1.29 each night, plus a one-time fee of $0.50. how much would it cost to rent a movie for 3 nights? 10 nights?

Ok so!
One night is 1.29 for each and every night. .50 is only a one time fee so your equation would look like this-
.50+1.29x
So for three nights, it would be a total of $4.37
For 10 nights, it would be a total of $13.40.
Hope I could help~ 

Neither is the answer