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Ivan purchased a prepaid phone card for $20.00. Calls cost 5 cents a minute using this card. The credit, C (in dollars ), left on

Ivan purchased a prepaid phone card for $20.00. 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)=20.00-0.05x

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