Set 1: Exponential Functions (Intermediate)

**Choice D is the best answer.** After 3 doublings: 400 times 2 to the power of 3 = 3200

Explanation

Answer: D

PROBLEM

A population starts at 400 and doubles every year. What is the population after 3 years?

3199

3201

3198

3200

✓ Correct

Detailed Explanation

Choice D is the best answer. After 3 doublings: 400 times 2 to the power of 3 = 3200

Why others are wrong:

A: 3199 is incorrect because it does not satisfy the equation.

B: 3201 is incorrect because it does not satisfy the equation.

C: 3198 is incorrect because it does not satisfy the equation.