Final answer:
To solve for a, you need to multiply 18 by 4 since A is divided by 4 to obtain 18. Hence, the equation is a = 4 × 18. So, the correct answer is a) a = 4 x 18.
Step-by-step explanation:
The question asks which operation would help solve for a if A divided by 4 equals 18. To find the value of "a", you need to perform the operation that reverses the division by 4. This means you will need to multiply 18 by 4. Therefore, the correct answer is a = 4 × 18.
Thus, the correct answer is a) a = 4 x 18.