math
posted by Taylor .
the amount of revenue brought in by states from motor vheicle licenses increased at a relatively constant rate of 499.79 million dollars per year from 1990 to 2000. In 2000, the states brought in 15099 million dollars in revenue from motor vehicle.
a: what was the approximate revenue from licenses in 1990
b: write an equation that give the revenue as a function of the number of year since 1990
c: find the revenue from licenses in 1999

499790000