Math

Open Ended

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.

2*5=10min.
15*3=45min.

Total cost per day=

Day-10min*$0.10=$1.00
Night-45min*$0.05=$2.25

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

10 cards=$300

$22.75*13=$295.75

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  1. 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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    Ms. Sue

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