Set 2: Exponential Functions

Choice A is correct. Choice A is the correct answer. Calculate using half-lives. 1. Half-lives: $\frac{2112}{704} = 3$ half-lives. 2. Remaining: $(\frac{1}{2})^3 = \frac{1}{8}$. 3. Result: $\frac{1}{8}$ of original amount remains. Strategic Tip: 3 half-lives = $(\frac{1}{2})^3 = \frac{1}{8}$. Choice B is incorrect because this is after 2 half-lives. Choice C is incorrect because this is after 1 half-life. Choice D is incorrect because this would be after 4 half-lives.