Excel's got pretty strong help on formulas. In an empty cell, go to the menu
bar and select Insert Formula. In the text box, you can enter some
keywords or a description of what you're trying to do, and you'll get back a
list of likely relevant functions. When you choose a function, and click OK,
the Function Arguments dialog will indicate the required (bold) and optional
arguments, and what they represent. At the bottom of the dialog window,
you'll also see a description of the function's purpose and see a link for
'help on this function.'

"Denny Crane" wrote:

Is there a tutorial online covering formulas. their formulation and use?