<PRE><B>Question 822517</B>
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v = K*e^(-0.0001205t)
K = 60 grams
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40 = 60*e^(-0.0001205t)
40/60 = e^(-0.0001205t)
ln( 40/60 ) = ln( e^(-0.0001205t) )
ln( 40/60 ) = (-0.0001205)t
t = ln( 40/60 )/(-0.0001205)
t = 3364.8557
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answer:
the fossil is about 3365 years old
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