x * (1/2)^(11/3.9) = 60
now just solve for x
How much of a radioactive substance must be presented to decay to 60 grams in 11 years if the half-life of the substance is 3.9 years?
Select one:
a. Between 400 and 420 grams
b. Between 420 and 440 grams
c. Between 440 and 460 grams
d. Over 460 grams
1 answer