document.write( "Question 572538: Carbon-14 has a half life of 5760 years. How old is a fossil that has 1/8 of the substance left?\r
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Algebra.Com's Answer #368629 by KMST(5328)\"\" \"About 
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After one half life, 1/2 of the original amount is left. As another half life passes, the amount left is halved again. So, after 2 half lives, you have 1/4 of the original amount left. As yet another half life passes, the amount left is halved again. So, after 3 half lives, you have 1/8 of the original amount left.
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