Set 2: Exponential Functions (Advanced)

**Choice D is the best answer.** After 3 half-lives: 160 / 2 to the power of 3 = 20 grams

Explanation

Answer: D

PROBLEM

A substance with half-life of 1 hour starts at 160 grams. How many grams remain after 3 hours?

✓ Correct

Detailed Explanation

Choice D is the best answer. After 3 half-lives: 160 / 2 to the power of 3 = 20 grams

Why others are wrong:

A: 19 is incorrect because it does not satisfy the equation.

B: 22 is incorrect because it does not satisfy the equation.

C: 21 is incorrect because it does not satisfy the equation.