document.write( "Question 968691: one method to determine the time since an animal died is to estimate the percentage of carbon-14 remaining in its bones. The percent P in decimal form of carbon-14 remaining after x years is given by P(x)=e^-0.000121x. Approximate (to the nearest whole year) the age of a fossil if there is 70% of carbon-14 remaining. show work \n" ); document.write( "
Algebra.Com's Answer #591901 by josgarithmetic(39618)\"\" \"About 
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\"0.70=e%5E%28-.000121x%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"ln%280.70%29=-0.000121x%2A1\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=ln%280.70%29%2F%28-0.000121%29\"
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