Set 2: Exponential Functions (Advanced)

**Choice D is the best answer.** After 1 half-lives: 160 / 2 to the power of 1 = 80 grams

Explanation

Answer: D

PROBLEM

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

A.

40

B.

82

C.

160

D.

80

✓ Correct

Detailed Explanation

Choice D is the best answer. After 1 half-lives: 160 / 2 to the power of 1 = 80 grams

Why others are wrong:

A: 40 is incorrect because it does not satisfy the equation.

B: 82 is incorrect because it does not satisfy the equation.

C: 160 is incorrect because it does not satisfy the equation.