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Today, 15:59

Derrick and Mark are brothers who live in the same house. Mark is at home, and Derrick is 5 miles away from home. Both boys begin riding their bikes at the same time. Derrick rides directly home at a constant rate of 15 mph, and Mark rides away from home at a constant rate of 18 mph. Let d represent distance from home, and t represent time in hours. Which system models this situation?

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  1. Today, 16:18
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    The system which models this situation is represented by the answer A.

    A.

    d = 5 - 15t

    d = 18t
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