SOLUTION: The half-life of a radioactive isotope is 7 years. Initially, there are 100 grams of the isotope. Which expression shows the amount of the isotope remaining after x years?

Algebra ->  Equations -> SOLUTION: The half-life of a radioactive isotope is 7 years. Initially, there are 100 grams of the isotope. Which expression shows the amount of the isotope remaining after x years?      Log On


   

Question 874078: The half-life of a radioactive isotope is 7 years. Initially, there are 100 grams of the isotope. Which expression shows the amount of the isotope remaining after x years?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Q(x) = Q%5B0%5De%5E%28-kx+%29
ln(.5)/-7 = k = .099
Q(x) = 100e%5E%28-.099x%29+