The amount of revenue brought in by states from motor vehicle licenses increased at a relatively constant rate of 499.79 million dollars per year from 1990 to 2000. In 2000, the states brought in 15,099 million dollars in revenue from motor vehicle licenses. a. What was the approximate revenue (in million dollars) from licenses in 1990? b. Write an equation that gives the revenue (in million dollars) as a function of the number of years since 1990. c. Find the revenue from licenses in 1999.