MS Excel
To create a formula, you first:

Choose the new command from the file menu
Select the cell you want to place the formula into
Type the equals sign (=) to tell Excel that you’re about to enter a formula
Enter the formula using any input values and the appropriate mathematical operators that make up your formula

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MS Excel
How do you delete a column?

Select the column heading you want to delete and select Insert Delete from the menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Right click the column heading you want to delete and select delete from the shortcut menu
Select the row heading you want to delete and select Edit>Delete from the menu

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