How do you delete the history of a TI-84 calculator?

Answer 1

Press 2ND MEM (above +). Then select option 7, "Reset...". Select All RAM and press yes. This clear clear all memory except for your applications (such as your games).

If you want to clear absolutely everything, then instead if choosing All RAM, go over to ALL and choose All Memory... and press yes. This will delete EVERYTHING, so make sure this is what you want.

Answer 2

To delete the history of previous entries, first press 2ND MEM (above +). Then Choose option 3, "Clear Entries". Press ENTER until the calculator says "Done".