keke6361
08.12.2020 •
Mathematics
A cell phone carrier charges a fixed montly fee plus a constant rate for each minute used. In January, the total cost for 250 minutes was $55 while in February, the total cost for 150 minutes was $53.
Choose the formula below which gives the function C(x) representing the monthly cost, in dollars, of a cell phone using x minutes.
Select the correct answer below:
C(x)=0.02x+50
C(x)=−0.02x+56
C(x)=0.05x+28
C(x)=−0.05x+78
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