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January 26, 2015

January 26, 2015

Posted by **melissa** on Wednesday, April 15, 2009 at 8:09pm.

- math -
**Rick_the_chemist**, Thursday, April 16, 2009 at 5:17amX = the cost of MaineCellular's plan

P = the cost of Portland Wireless' plan

T = time in minutes.

X = $12 + $0.10 T

P = $20 + $0.05 T

P = X at the number of minutes that the two costs cross. So, set X = P

$12 + $0.10 T = $20 + $0.05 T

Solve for T.

Once you have T, anything less than T minutes will give one of the plans an edge. Which one?

Anything greater than T minutes will give the other plan the edge.

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