Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by
S(t) = 68 - 20 log (t+1), t > 0

11. Students in an accounting class took a final exam and then took equivalent forms of the exam at monthly intervals thereafter. The average score
as a percent, after t months was given by

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