The revenue for McDonald' Corporation ( in billions of dollars) for the years 2010 to 2015...

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The revenue for McDonald' Corporation ( in billions of dollars) for the years 2010 to 2015 can be approximated by th quadratic function R(x) =x? + 13x-57 where x-10 corresponds to the year 2010. (a) Find the vertex. (b) In what year during this period was revenue at a maximum? %3! The revenue for McDonald' Corporation ( in billions of dollars) for the years 2010 to 2015 can be approximated by th quadratic function R(x) =x? + 13x-57 where x-10 corresponds to the year 2010. (a) Find the vertex. (b) In what year during this period was revenue at a maximum? %3!