Texasinstruments TI-89 Titanium Programmable Graphing Calculator TI-89 Titanium Programmable Graphing Calculator Display Window—160 x 100 pixels Display Notation—Graphic Storage Memory—2.7MB 3-D Graphing Graphs, Rectangular Functions Graphs, Polar Equations Graphs, Parametric Equations Graphs, Differential Equations Interactive Zoom Programming Steps/Storage—Memory limits Programming Subroutines Hypothesis Testing Confidence Interval Calculating Hyperbolic Functions Trig/Log Functions Base Conversions & Math Logical (Boolean) Operations Simultaneous Equations Calculus Operations Matrices Complex Numbers Polynomial (Quadratic) Equations Equation Editor Equation Playback Direct Algebraic Logic Simple Scientific Functions Variable Statistics—Two Size—3-3/8w x 7-1/2d Replacement Batteries—4 AAA + Lithium (included) I/O Port USB Cable Included Permitted for use on many state and standardized tests.