Useful life. An amusement company maintains records for each video game it installs in an arcade. Suppose that C(t) and R(t) represent the total accumulated costs and revenues (in thousands of dollars), respectively, t years after a particular game has been installed. If
then find the area between the graphs of C′ and R′ over the interval on the t axis from 0 to the useful life of the game and interpret the results.
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