Built-in interactive "Grab-and-Move" interface lets students observe relationships and the impact of changes to related equations and data. Explore on one screen up to four representations of a single problem, including algebraic, graphical, geometric, numeric and written. Calculator application lets students enter and view expressions, equations and formulas exactly as they appear in math textbooks. Graph equations, expressions and other functions, then watch in real time how changes to variables impact data. Easily link to another TI-Nspire or a PC for file transfer. Power Source(s): Battery; Display Notation: Graphic; Number of Display Digits: N/A; Display Characters x Display Lines: 16 x 8.