Answer:
c. 212,000 years
Step-by-step explanation:
got it right on edge:3
212 000 yrs
15/16 decay means 1/16 is left
how many halflives is this?
(1/2)^n = 1/16
n = 4 half lives
4 half lives * 53 000 yr/ half life = 212 000 yrs
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