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Mathematics 21 Online
OpenStudy (anonymous):

A group of students retake the written portion of a driver?s test after several months without reviewing the material. A model used by psychologists describes retention of the material by the function a = 90 - 10 log (t + 2), where a is the average score at the time t (in weeks). Use the model to predict the number weeks when the average score is 75.

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