MS Excel
To create a formula, you first:

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
Choose the new command from the file menu

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MS Excel
To save a workbook, you:

Click the save button on the standard toolbar from the menu
Press Ctrl+ F5
Select Edit > Save
Click Save on the Windows Start button

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