Jared is an intern at a real estate broker’s office. He was asked to record data on the difference of the number of sales made each month by the whole team of realtors and the average number of sales made by similar brokers’ offices. After gathering the current year’s data, Jared decided to include the previous year’s data as well. Using all of the data, he created this function to model the team’s sales, where x is the number of months since January, when Jared began gathering data, and is the number of sales as compared with the average.