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Mathematics 14 Online
OpenStudy (anonymous):

A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10 – c for each minute thereafter. What is the cost, in cents, of a 10-minute phone call? (A) 200 – 20c (B) 100c + 70 (C) 30 + 7c (D) 100 – 7c (E) 100 – 70c

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