document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1162733>Question 1162733</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The half-life of a radioactive element is 5 days. How long will it a 1000 g sample to decay to 62.5 g?\r<BR>\n" );
document.write( "\n" );
document.write( " 		<BR>\n" );
document.write( "15 days\r<BR>\n" );
document.write( "\n" );
document.write( " 		<BR>\n" );
document.write( "20 days\r<BR>\n" );
document.write( "\n" );
document.write( " 		<BR>\n" );
document.write( "2.5 days\r<BR>\n" );
document.write( "\n" );
document.write( " 		<BR>\n" );
document.write( "5 days<BR>\n" );
document.write( " 		<BR>\n" );
document.write( "10 days\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #786574 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=786574\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1000%2F62.5+=+1%2F16+=+1%2F2%5E4+=+%281%2F2%29%5E4 ALIGN=MIDDLE  ALT=\"1000%2F62.5+=+1%2F16+=+1%2F2%5E4+=+%281%2F2%29%5E4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "So 4 half lives = 4*5 days = 20 days<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );