Homework Help: Pre Algebra

Posted by Sondra on Wednesday, October 12, 2011 at 11:48pm.

A phone company charges $27.95 monthly fee and .12/min. for local calls. Another phone company charges $12.95 a month and .32/minute for local calls. For what number of minutes of local calls is the cost of the plans the same?

Pre Algebra - Steve, Thursday, October 13, 2011 at 12:47am
What's the problem? Just write an expression for each company, set them equal, and solve the equation.

company A charges 27.95 + .12m for m minutes

company B charges 12.95 + .32m for m minutes

27.95 + .12m = 12.95 + .32m
15.00 = .20m
75 = m

check:
27.95 + .12(75) = 36.95
12.95 + .32(75) = 36.95

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