Mathematics, 03.11.2021 03:30 samiiegarciia

A Karen purchased a prepaid phone card for $20.50. Calls cost 9 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=20.50 -0.09x
How much credit is left on the card after Karen uses it for 30 minutes of calls?

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A Karen purchased a prepaid phone card for $20.50. Calls cost 9 cents a minute using this card. Th...

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