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Research and Development The amounts (in billions of dollars) the U.S. federal government spent on research and development for defense from 2010 through 2014 can be approximated by the model
where t represents the year, with
(a) Use a graphing utility to graph the model.
(b) Find the average rate of change of the model from 2010 to 2014. Interpret your answer in the context of the problem.
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