lesly0913
11.02.2022 •
Mathematics
Kevin purchased a prepaid phone card for $30.00. 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 function.
C(x) =30.00 – 0.09x
How much credit is left on the card after Kevin uses it for 20 minutes of calls?
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