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Debra purchased a prepaid phone card for $15.00. Calls cost 5 cents a minute using this card. The credit, C (in dollars), left on the

Debra purchased a prepaid phone card for $15.00. Calls cost 5 cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of calls is given by the following function. C(x)=15.000-0.05x

How much credit is left on the card after Debra uses it for 40 minutes of calls?

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