3
QuizMultiple Choice
Introduction to Modeling with Functions
Question 3 • (CR27) ALG 1-1200310-S2-Degele-VOL7006P
The amount of a radioactive substance remaining after t years is given by the function , where m is the initial mass and h is the half-life in years. Iron has a half-life of 2.7 years. Which equation gives the mass of a 200 mg iron sample remaining after t years, and approximately how many milligrams remain after 12 years?
Answer
A
; 2.6 mg
B
f(t)=2.7(0.5)t; 0.0007 mgC
f(t)=200(0.5)t; 0.05 mgD
; 9.2 mg