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AP Macroeconomics students were given an exam on a particular topic. Each week, they were tested with a comparable exam on the same topic and

AP Macroeconomics students were given an exam on a particular topic. Each week, they were tested with a comparable exam on the same topic and the average score for the class was measured. The functionM(t) = 80 - 10log(t+ 2) models the average score for the class aftertweeks. How many weeks will it take for the average score of the class to equal 70?

8 weeks

9 weeks

10 weeks

11 weeks

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