Set 3: Exponential Functions (Advanced)

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

Explanation

Answer: A

PROBLEM

Recent studies show that a substance with half-life of 1 hour starts at 320 grams. How many grams remain after 1 hours?

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

160

✓ Correct

320

161

162

Detailed Explanation

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

Why others are wrong:

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

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

D: 162 is incorrect because it does not satisfy the equation.