Mathematics, 03.09.2021 01:10 Iakwe5061
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Keith purchased a prepaid phone card for $15.00 . 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)=$15.00-0.09x
How much credit is left on the card after Keith uses it for 30 minutes of calls?
Answers: 1
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