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July 31, 2014

July 31, 2014

Posted by **misty** on Sunday, January 8, 2012 at 12:50pm.

- Algebra -
**Steve**, Sunday, January 8, 2012 at 4:15pmfor charges,

r = 50 + 15m for m units

t = 70 + 10m

you want

r < t

50 + 15m < 70 + 10m

5m < 20

m < 4

so, if the call lasts less than an hour (4 units of 15 min. each) it will be cheaper to call Rick.

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