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Mathematics 15 Online
OpenStudy (anonymous):

Trevor's dad decided to get him a cell phone for his birthday. Cell Plus has a plan that costs $25.00 per month plus an additional $0.06 per minute. Cell Best has a plan that costs $30.00 per month plus an additional $0.05 per minute. How many minutes can Trevor talk and both cell plans cost the same amount? 100 1000 500 50

OpenStudy (anonymous):

How would you write each plan as a formula?

OpenStudy (shane_b):

Where x = minutes: \[Cell~Plus=$25+$0.06x\]\[Cell~Best=$30+$0.05x\]\[$30+$0.05x=$25+$0.06x\]Just solve for x

OpenStudy (anonymous):

i just worked it out..its 1000 :)

OpenStudy (shane_b):

I got 500...

OpenStudy (anonymous):

u did? hmm

OpenStudy (anonymous):

maybe im wrong lol

OpenStudy (shane_b):

Did you start with the same equations?

OpenStudy (shane_b):

Check this out: http://www.wolframalpha.com/input/?i=solve+for+x%3A+25%2B.06x%3D30%2B.05x

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