How much credit is left on the card after alonzo uses it


Alonzo purchased a prepaid phone card for $25.25  .Calls cost 20 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)=25.25-0.20x

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

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Mathematics: How much credit is left on the card after alonzo uses it
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