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Mathematics, 10.12.2021 20:50 cdeanrn8971

A long-distance carrier charges $1.20 for a 10-minute call, $1.80 for a 15-minute call, and $2.40 for a 20-minute call.

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A long-distance carrier charges $1.20 for a 10-minute call, $1.80 for a 15-minute call, and $2.40...
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