SOLUTION: Human hair from a grave in Africa proved to have only 67% of the carbon 14 of living tissue. When was the body buried? The half life of carbon 14 is 5730 years.

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Hi,

Q(t) = 

First find k

ln(.5)/-5730 = k = .00012

 Q(t) = 

ln(.67)/-.00012 = t ~ 3337yrs  ago