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Anais, a math teacher, noticed that the average grade, G, on an exam given that n students - watch the related video can be

Anais, a math teacher, noticed that the average grade, G, on an exam given that n students - watch the related video can be given by the function G(n) = 50+ 1.5n. She also noticed that the number, S, of students who watch an m minute video can be modeled by the function S(m) = 30 - m. which Write expression gives the average grade on an exam if the related video is m minutes?

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