document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=78709>Question 78709</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do u solve this question?\r<BR>\n" );
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document.write( "A study monitored the life spans of 129 robins over 4 years.  The equation   was developed to calculate the number of years y for x percent of the robin population to die.<BR>\n" );
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document.write( "y= 2-log(100-x)/.42\r<BR>\n" );
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document.write( "How many robins had died after 6 months?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #56444 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=56444\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the robin population to die.\r<BR>\n" );
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document.write( "y= 2-log(100-x)/.42 <BR>\n" );
document.write( "How many robins had died after 6 months?<BR>\n" );
document.write( "Let y=(1/2) yr and solve for x:<BR>\n" );
document.write( "0.5=2-log(100-x)/0.42<BR>\n" );
document.write( "-1.5=-log(....)/0.42<BR>\n" );
document.write( "log(100-x)=0.63<BR>\n" );
document.write( "100-x=10^0.63<BR>\n" );
document.write( "100-x=4.2657<BR>\n" );
document.write( "x=95.73%<BR>\n" );
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document.write( "# of robins that died is 0.9573*129=123+<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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