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Answer to Question #44470 in Algebra for alex

Question #44470
Students in a fifth-grade class were given an exam. During the next 2 years, the same students were retested several times. The average score was given by the model
f(t) = 86 - 20 \log_{10}(t+1), \qquad 0\leq t\leq 24
where t is the time in months.
(a) What is the average score on the original exam?

(b) What was the average score after 6 months?

(c) What was the average score after 18 months?
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