document.write( "Question 1192688: Skeletal remains had lost 85% of the C-14 they originally contained. Determine the approximate age (in years) of the bones. (Assume the half life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)
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Algebra.Com's Answer #824626 by josgarithmetic(39630)\"\" \"About 
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\"y=A%281%2F2%29%5E%28x%2F5730%29\"; initial amount, A, final amount, y, time in years x.\r
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\n" ); document.write( "\n" ); document.write( "\"%281%2F2%29%5E%28x%2F5730%29=y%2FA\"\r
\n" ); document.write( "\n" ); document.write( "\"log%28%28%281%2F2%29%5E%28x%2F5730%29%29%29=log%28%28y%2FA%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"%28x%2F5730%29log%28%281%2F2%29%29=log%28%28y%2FA%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"x=5730%2Alog%28%28y%2FA%29%29%2Flog%28%281%2F2%29%29\"\r
\n" ); document.write( "\n" ); document.write( "Lost 85% means kept 15% as remaining\r
\n" ); document.write( "\n" ); document.write( "\"x=5730%2Alog%28%280.15%29%29%2Flog%28%281%2F2%29%29\"\"substitutions_of_values\"
\n" ); document.write( "\"+x=15682\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28x=15700%29\" \"best+keep+three+significant+figures\"\r
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\n" ); document.write( "\n" ); document.write( "\"y=Ae%5E%28-0.00012097x%29\"\r
\n" ); document.write( "\n" ); document.write( "\"0.15=e%5E%28-0.00012097x%29\"\r
\n" ); document.write( "\n" ); document.write( "\"ln%280.15%29=-0.00012097x\"\r
\n" ); document.write( "\n" ); document.write( "\"x=-ln%280.15%29%2F0.00012097\"\r
\n" ); document.write( "\n" ); document.write( "\"x=15682\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28x=15700%29\"
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