Final answer:
The valid formula among the options is =B5/10 =E10 (C2-D16) A2/F2.
Step-by-step explanation:
The valid formula among the options is =B5/10 =E10 (C2-D16) A2/F2. Each of the options is a formula written in spreadsheet notation, where the equals sign indicates that the cell contains a formula. The first option, =B5/10, divides the value in cell B5 by 10. The second option, =E10 (C2-D16), multiplies the value in cell E10 by the result of subtracting the value in cell D16 from the value in cell C2. The third option, A2/F2, divides the value in cell A2 by the value in cell F2.