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The revenue for a restaurant chain (in billions of dollars) for the years 2010 to 2015 can be approximated py the following quadratic function, where

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The revenue for a restaurant chain (in billions of dollars) for the years 2010 to 2015 can be approximated py the following quadratic function, where x=10 corresponds to the year 2010 . R(x)=21x2+15x48 (a) Find the vertex. (b) In what year during this period was revenue at a maximum? (c) What was the maximum revenue, to the nearest billion dollars

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