This document is about the use of the E-1 hp 9g graphing calculator, including power supply, turning on or off, battery replacement, auto power-off function, reset operation, contrast adjustment, display features, graph display, calculation display, changing modes, selecting an item from a menu, key labels, using the 2nd and ALPHA keys, cursor operation, inserting and deleting characters, recalling previous inputs and results, memory usage, running memory, standard memory variables, storing an equation, array variables, order of operations, accuracy and capacity, error conditions, and basic calculations.
