Total restaurant sales (in billions of dollars) are given in the following chart.
(Source: National Restaurant Association)
| Year | 1990 | 1991 | 1992 | 1993 | 1994 |
| Sales | 76.1 | 78.4 | 80.3 | 83.1 | 85.5 |
a) Write the linear regression model, S(t), that represents the sales since 1985 (not 1990). That means 1990 would be year 5.
b) What does the model predict for restaurant sales for the year 2000?
