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Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, B, can be modeled by
the equation B = 40 - 0.4n, where n is the number of minutes he's talked since purchasing the card.

Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, B, can be modeled by the equation B = 40 - 0.4n, where n is the number of mi class=

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