Jane has a pre-paid cell phone with Ringular. She can't remember the exact costs, but her plan has amonthly fee and a charge for each minute of calling time. In June she used 400 minutes and the costwas $147.00. In July she used 860 minutes and the cost was $285.00.aA) Express the monthly cost C as a function of 2, the number of minutes of calling time she used.Answer:
