Mathematics, 22.06.2019 09:20 vickygloom

While reviewing for exams a teacher knows that the number of topics he can cover is directly proportional to the length of time he has to review. if he can cover 9 topics in a single 45-minute period, how many topics can he cover in a 1-hour period? a) 5 b) 7 c) 10 d) 12

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