A new video game is expected to sell 120 copies the first hour at a local game store. After that, the sales will follow the function s (x) = 15 (x - 1) where x is the number of hours. What is the function that shows total sales, including the first hour?

The first hour, they sell 102 copies.

So the function starts with : s (x) = 102 + (I put a + after 102 because we know that there are following sales after the first hour).

Then, the sales are s (x) = 11 (x-1).

So this is the second part of your function.

Answer: 102 + 11 (x-1)