Thursday
April 17, 2014

Homework Help: Algebra

Posted by Gemma on Saturday, January 24, 2009 at 11:50am.

A long-distance call using DEC costs 20 cents for the first minute and 16 cents for each additional minute. The same call, placed on LCS, costs 19 cents for the first minute and 18 cents for each additional minute. For what length of phone calls is DEC less expensive?

Here's my inequality and how I solved it:

.16c + .20 < .18c +.19
I subtracted .19 from each side

.16c + .01 < .18c
I subtracted .16c from each side

.01 < .02c
I divided each side by .02.

My final answer does not make sense to me: c > .5. Half a phone call, or half a minute? I think I must have messed up somewhere, so if you see a mistake, please tell me.

Thank you!

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