Question 982396
If you're just writing the function to represent the cost, it us basically just the equation.

C(x) represents the total cost and x is the number of movie channels.
the $25 is what you will pay no matter what and the $8 is multiplied be the number of movie channels

c(x) = $8x + $25    ~would be the function you'd use to find total cost     depending on the number of movie channels (x).