Used Texas Instruments TI-83 Plus Graphing Calculator

Texas Instruments TI-83 Plus calculator, including Portuguese instruction manual and interactive CD. Some features of this calculator: High-resolution display with 8 lines and 16 characters per line, 64×96 pixels. Graphing of up to 10 functions, 6 polar equations, 6 parametric equations, and 3 sequences defined either by general term or recurrence relation. Zoom, graph tracing, and value tables. Graph plotting in seven different styles. Calculation of maxima and minima, inflection points, and derivatives on graphs. Statistical graphs. One- and two-variable statistical functions with 10 regression models. Split-screen functionality. Matrix operations. Stores up to 10 matrices; dimensions limited only by available memory. Complex numbers. Advanced statistical functions, including probability distributions, hypothesis tests, and confidence intervals. Financial calculations. Equation solver function. Function catalog. 32 KB of RAM (24 KB available for user use). 160 KB of flash memory (supports installation of up to 10 applications). Computer connectivity via TI Graph Link cable (included). Compatible with TI Keyboard. Operation in Portuguese. Powered by four AAA alkaline batteries (not included) and one lithium backup battery (included) to preserve memory. Used, but in very good condition.