Infographic: Electricity A visual cheat sheet about electrical physics, containing the most important formulas of current and Ohm’s law expressed through an impossible water circuit analogy. (by Pierluigi Scotolati)
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Complex Number Set Diagram
College Algebra (Quick Study Academic) by Inc. BarCharts http://www.amazon.com/dp/1423220315/ref=cm_sw_r_pi_dp_1-FStb1DBBCFJTB6 $5.35
Standard Graphs Poster
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Pi Day Infographic- Free Pi Day Activities
This has most likely been posted here before, but it's incredibly useful.