Solve the Equation: Finding the Missing Operation in 4?0=4

Let's solve this problem by evaluating each operation:

• Test Addition: $4 + 0 = 4$. This operation holds true since adding zero to a number does not change the value of the number.

• Test Subtraction: $4 - 0 = 4$. This operation is also consistent with the rule that subtracting zero from a number keeps the number unchanged.

• Test Multiplication: $4 \times 0 = 0$. This does not satisfy the equation $4 ? 0 = 4$, as multiplying by zero results in zero rather than four.

From this analysis, the operations "+" and "-" both satisfy the original problem statement $4 ? 0 = 4$. Therefore, the correct answer must reflect both options.

Therefore, the correct answer is Answers (a) and (b).