Online sales, which make up about 5% of total retail sales in the United States, are expected to top $400 billion by 2017. Using data from 2000 and projected to 2017, the revenue, in billions of dollars, can be described by
y = 1.230x2 - 22.87x + 142.9
where x is the number of years past 1990. Use this function in Problems.
1. Graph the function for x = 0 to x = 27.
2. The data starts in 2000, at x = 10, and the function may not apply before then. The graph has a minimum point; where is this point?