Marla made a spreadsheet in Excel showing the projected costs for a concert she was putting on. What can Marla enter into cell A11 to find out how much money is left in her budget and to make sure the cell is updated whenever she changes any of the other costs? =A2-A4-A6-A8-A10 +A2-A4-A6-A8-A10 =A4-A6-A8-A10+A2 +A4-A6-A8-A10=A2