Question 860147
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
Q(t) ={{{ Q[0]e^(-kt)}}} 
First find k
ln(.5)/-5730 = k = .00012
 Q(t) ={{{ Q[0]e^(-.00012t)}}} 
ln(.67)/-.00012 = t ~ 3337yrs  ago