You can either format the "3" as superscript (for example via the Font
dialog box), or press Alt+0179 (use the numbers on the numeric keypad, with
NUMLOCK activated) to insert the ³ symbol.
Either enter a 3 and use Format, Font, Superscript, or Use Insert Symbol and
this cubed is in the basic character set, or press Alt+0179.
Hope this helps
DeanH