Performs 335 advanced scientific functions. WriteView technology displays formulas as written in textbooks. DAL (Direct Algebraic Logic) makes it easy to enter formulas into the calculator. Three modes: Normal, Drill and Stat. Multi-line playback and editing function. Nine independent memories and four programmable keys. Two variable statistic functions and fraction calculations. Permitted for use on AP Chemistry, AP Physics, PSAT/NMSQT, SAT I, SAT II, Math IC & Math IIC tests.