document.write( "Question 622773: A certain radioactive isotope decays at a rate of 0.1% annually. Determine the half-life of this isotope, to the nearest year. \n" ); document.write( "
Algebra.Com's Answer #391619 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi,
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document.write( "A certain radioactive isotope decays at a rate of 0.1% annually.  
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document.write( "Determine the half-life of this isotope, to the nearest year.
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document.write( " \"I+=+I%5B0%5De%5E%28-.001%2At%29\"
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document.write( " \"+1%2F2+=+e%5E%28-.001%2At%29\"
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document.write( " ln(.5) = -.001*ln e^t
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document.write( " ln(.5)/-.001 = t \n" );
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