document.write( "Question 1201597: Radioactive Carbon-14,which is found in all living things, has a half-life of 5700 years and can be used to date fossils. Suppose a fossil contains 15% of the amount of Carbon-14 that the organism contained when it was alive. Calculate the age of the fossil. \n" ); document.write( "
Algebra.Com's Answer #836053 by josgarithmetic(39617)\"\" \"About 
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C14, half life 5700 years\r
\n" ); document.write( "\n" ); document.write( "\"y=p%281%2F2%29%5E%28x%2F5700%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"log%28%28y%29%29=log%28%28p%29%29%2B%28x%2F5700%29log%28%281%2F2%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"log%28%28y%29%29-log%28%28p%29%29=%28x%2F5700%29log%28%281%2F2%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"%28log%28%28y%29%29-log%28%28p%29%29%29%2Flog%28%281%2F2%29%29=x%2F5700\"\r
\n" ); document.write( "\n" ); document.write( "\"%28log%28%28p%29%29-log%28%28y%29%29%29%2Flog%28%282%29%29=x%2F5700\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight_green%28x=%285700%2Flog%28%282%29%29%29%28log%28%28p%2Fy%29%29%29%29\"
\n" ); document.write( "substitute for
\n" ); document.write( "p=100
\n" ); document.write( "y=15
\n" ); document.write( "and evaluate x.
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