Answered

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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?

Sagot :

tkarky88
If trying to solve for x it would be x = 30 over C+0.09. If trying to solve for C then it would be C=30 over x - 0.09.
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