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# The number of companies offering residential long-distance telephone service has grown rapidly in recent years.

The number of companies offering residential long-distance telephone service has grown rapidly in recent years. The plans they offer vary greatly and it can be difficult to select the plan that is best for you. Here are five typical plans:Plan1: A flat fee \$50 per month for unlimited calls.Plan2: A \$30 per month fee for total of 30 hours of calls and an additional charge of \$0.01 per minute for all minutes over 30 hours.Plan3: A\$5 per month fee and charge of \$0.04 per minute for all calls.PLan4: A\$2 per month fee and a charge of \$0.045 per minute for all calls, the fee is waived if the charge for calls is \$20 or more.Plan5: A charge of \$0.05 per minute for all calls, there are no additional fees.A) Construct a mathematical model for each plan that gives the total monthly cost in term of the total number of minutes of call placed in a month.
Teacher's given time is: 5 hours.

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