Concept explainers
A new teaching method to teach vocabulary to sixth-graders involves having students work in group on an assignment to learn new words. After lesson was completed, the students were tested at 1-month intervals. The average score for the class S(t) can be modeled by S(t)=94−18 ln(t+1)
where t is the time in months after completing the assignment. If the average score is 65, how many months had passed since the students completed the assignment? Round to the nearest month.

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