Jane has a pre-paid cell phone with Ringular. She can't remember the exact costs, but her plan has a
monthly fee and a charge for each minute of calling time. In June she used 310 minutes and the cost was
$100.00. In July she used 760 minutes and the cost was $190.00.
A) Express the monthly cost C in terms of x, the number of minutes of calling time she used.
Answer:
B) If Jane used 864 minutes of calling time in August, how much was her bill?
Answer: S
