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Nick is starting college in the fall. She has purchased a Star Phone card for $30.00for long didtance calls. The calls cost 10 cents per minute nation wide during the daytime, 6 a.m - 6 p.m
and 5 cents per minute nationwide at night, 6 p.m-6a.m.

Every day Nick plans to make 2 daytime calls, each 5 minutes long, and 3 night calls, each 15 minutes long.

-Will one phone card last for a week? Support answer mathematically.

-What is the least # of cards nicole will need during the first 13 week semester at college? Support ansere mathematically.

I copied off of someone and therefore I don't understand how this person came up with the answer. So could you help me understand how this person came up with the answer? This is what it looks like.


Total cost per day=


Total cost per week is $3.25*7=$22.75

10 cards=$300


  • Math - ,

    2 daytime calls = 10 min. * $0.10 = $1.00 per day

    3 night calls = 45 min. * $0.05 = $2.25 per day

    $2.25 + $1.00 = 3.25 cost of calls per day.

    You can take it from here. We'll be glad to check your answers.

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