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Texas Instruments TI-83 Plus Graphing Calculator - Black - $48 (park slope)
1st Street near 6th AVe
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Permitted for use on SAT, PSAT/NMSQT, ACT, AP, IB and Praxis exams
Offers large 64 x 96 pixel, 8 x 16 display; 24KB of RAM; and 160KB Flash ROM memory
Also graphs 3 recursively-defined sequences; TVM, cash flows, amortization, and complex numbers