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Martina purchased a prepaid card for $30. Long distance calls cost 11 cents a minute using this card. Martina used her card only once to .ake a long distance call. If the remaining credit on her card is $28.46, how many minutes did her call last.

Respuesta :

we get that

[tex]\begin{gathered} 28.46+0.11t=30 \\ t=\frac{30-28.46}{0.11}=14 \end{gathered}[/tex]

so her call last 14 minutes

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