Answer to Question #56780 in Algebra for Jeff

Question

5: The function Q(t) = Qoe^-kt may be used to model radioactive decay. Q represents the quantity remaining after t years; k is the decay constant, 0.00011. How long, in years, will it take for a quantity of plutonium-240 to decay to 25% of its original amount?

A: 12,602 years
B: 1,575 Years
C: 3,150 years
D: 9,450 years


6: Plutonium-240 decays according to the function Q(t)= Qoe^-kt . How long will it take 27 grams of plutonium-240 to decay to 9 grams?

K is the decay constant, 0.00011

A: 2,100 years
B: 1.44 years
C: 18,900 years
D: 9,987 years