# SAT Math Multiple Choice Question 139: Answer and Explanation

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**Question: 139**

**4.** If a = and a is a nonzero integer, which of the following is equivalent to a ?

- A. 4a
- B. 4
- C.
- D. 2

**Correct Answer:** D

**Explanation:**

D The first step here is to simplify the equation and solve for a. Start by multiplying both sides by 16 to get 16a = 4a^{2}. Divide both sides by 4 to get 4a = a^{2}. Divide both sides by a to get 4 = a. This is now your target answer. Plug a = 4 into the values of a in the answer choices to determine which one matches 4. Choice (D) is the answer, since 2 = 2 = 2(2) = 4.