6
Answer: DSet 1: Exponential Functions (Advanced)
Explanation
PROBLEM
A substance with half-life of 1 hour starts at 480 grams. How many grams remain after 3 hours?
A substance with half-life of 1 hour starts at 480 grams. How many grams remain after 3 hours?
A.
120
B.
62
C.
61
D.✓ Correct
60
Detailed Explanation
Choice D is the best answer. After 3 half-lives: 480 / 2 to the power of 3 = 60 grams
Why others are wrong:
A: 120 is incorrect because it does not satisfy the equation.
B: 62 is incorrect because it does not satisfy the equation.
C: 61 is incorrect because it does not satisfy the equation.