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

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13 votes

we get that

$\begin{gathered} 28.46+0.11t=30 \\ t=(30-28.46)/(0.11)=14 \end{gathered}$

so her call last 14 minutes

Morten Olsen answered Jan 13, 2023

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