Radioactive decay follows first order kinetics.
The rate law of first order is
k = [2.303/t] log [ a/a-x]
where k = rate/decay constant = 0.693/half life = 0.693 /5720 yr
t= time for decay =??
a = 100
a-x = (100-75) = 25
thus
t = [2.303/ (0.693/5720)] log [100/25]
=11444.49yr
Moving to another question will save this response stion 24 Carbon-14 has a half-life of 5720...
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