Please solve

Suppose that, for a particular social networking company, the annual revenue from rich media advertisements, in millions of dollars, for the years 2007 through 2012 can be approximated with the model R(:c) = :54 + 149:3 402:2 + 47x, where a: is the number of years from the beginning of 2007. a. For this company, what was the revenue from rich media advertisements at the beginning of 2010? $ million b. At what rate was the revenue changing in the year 2010? $ million per year