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Mathematics, 18.07.2019 06:00 22danny

Caleb practices piano 20 minutes per day, and he practices guitar 30 minutes per day. which expression represents the number of minutes caleb spends practicing instruments after d days? select each correct answer. a. 20+d+30+d b. d(20+30) c. 20(30+d) d. 20d+30d

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