HP39GS Graphing Calculator Tackle the toughest problems with 600+ built-in functions plus powerful HP solvers and Enter data via algebraic entry and easy-to-use interactive tools Switch between three viewing options to enhance learning: symbolic, numeric, and graphic See everything you need at once on the dynamic split screen, which has adjustable contrast for Don't waste time reprogramming: save work and settings as applets (e-lessons) for later use