To use AutoSum with a row of four values, where must your cursor be to have the sum appear in the row if you have not highlighted the cells?

on the first empty cell to the right of the last cell containing a value.

Explanation:

The AutoSum function in excel gives a shortcut path to taking the sum of numeric values in a row or column of data. The Autosum uses the sum function to take the addition of all the desired rows or columns values without needing to make a manual highlight of the data. To use AutoSum with a row of 4 values, the cursor must be placed immediately at the cell next 4th row cell containing a value. This is equivalent to the first empty cell to the right of the last cell containing a value, then autosum is clicked in the home tab and all 4 cells will be highlighted as it uses the sum function to calculate the sun of the 4 row values.