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Mathematics 20 Online
OpenStudy (anonymous):

Please help! Will fan and medal!

OpenStudy (anonymous):

Martha wants to compare some cell phone plans by graphing their cost per text message. Cindos charges a flat rate of $30 for unlimited texts. Cell-On-The-Go has no set-up charge, but it does charge $0.10 per text. Ringit Wireless only charges $0.05 per text, but it has an account charge of $15.

OpenStudy (anonymous):

Explain to Martha how she can graph these cell phone plans and, describe what key features of the graphs she should consider when making a decision.

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