The profit function in millions for a beverage company for the years 2009 through 2017 can be approximated by f x 28x 616x 1025 where x 9 corresponds to the year 2009 a During what year did a local maximum profit occur b What was the maximum profit GEILE a A local extremum occurs at a critical number of f Because the derivative exists for every x the only critical number s occur where the derivative is zero Find the derivative of f x f x A local maximum profit occurred in the year b The maximum profit was million Simplify your answer Round to the nearest integer as needed