Set 1: Exponential Functions (Advanced)

**Choice D is the best answer.** After 1 half-lives: 320 / 2 to the power of 1 = 160 grams

Explanation

Answer: D

PROBLEM

A substance with half-life of 1 hour starts at 320 grams. How many grams remain after 1 hours?

320

161

159

160

✓ Correct

Detailed Explanation

Choice D is the best answer. After 1 half-lives: 320 / 2 to the power of 1 = 160 grams

Why others are wrong:

A: 320 is incorrect because it does not satisfy the equation.

B: 161 is incorrect because it does not satisfy the equation.

C: 159 is incorrect because it does not satisfy the equation.