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  • 06-10-2022
  • Mathematics
contestada

John purchased a prepaid phone card for $45.75. Calls cost 10 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.
C=45.75-0.10x
How much credit is left on the card after John uses it for 30 minutes of calls?

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