The approximate rate of change in the number (in billions) of monthly text messages is given by the equation f'(t)=6.8t-16.2 where t represents the number of years since 2000. In 2002 (t=2) there were approximately 8.7 billion monthly text messages. a. Find the function that gives the total number (in billions) of monthly text messages in year t. f(t) =

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