at an archaeological site remains of plant material will found to have 28.9% of the amount of carbon-14 in a living sample. What was the approximate age of the plant material?

Answer 1

look up the half-life of C-14. If it is k years, then the amount left after t years is

(1/2)^(t/k)

So, you want to solve for t in

(1/2)^(t/k) = 0.289