MS Excel
To center worksheet titles across a range of cells, you must

Select the cells containing the title text plus the range over which the title text is to be enfettered
Select the cells containing the title text plus the range over which the title text is to be centered
Widen the columns
Format the cells with the comma style

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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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