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Do the students really need graphing calculators? I would use a simpler calculator like Casio FX-82ES (seems to be called FX-300ES in the states).

http://www.casio.com/products/Calculators_%26_Dictionaries/Scientific_%26_Financial/FX-300ES/

Most graphs in algebra can be constructed using pen and paper. If you need to show some graphs construct them using matlab and print them on paper.

So, do the students need graphing calculators?

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