Michael purchased a prepaid phone card for $35.00.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 function.
C(x)=35.00-0.10x
How much credit is left on the card after Michael uses it for 50 minutes of calls?
To find how much credit is left on the card after 50 minutes of calls, we can substitute x = 50 into the function C(x) = 35.00 - 0.10x:
C(50) = 35.00 - 0.10(50)
C(50) = 35.00 - 5.00
C(50) = 30.00
Therefore, there will be $30.00 left on the card after Michael uses it for 50 minutes of calls.