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Texas Instruments TI-83 PLUS Graphing Calculators - $25 (Silverton)
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Graphing Calculator With Cover works fine. SILVER EDITION features approximately nine times the available flash memory, and over twice the processing speed of a standard TI-83 Plus, all in a translucent grey case inlaid with small "sparkles".
This is an essential tool for high school and college math and science courses, including Algebra, Geometry, Trigonometry, Calculus, and Statistics. Features include function graphing, polar/parametric/sequence graphing modes, statistics, trigonometric, and algebraic functions. $35
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