document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1146977>Question 1146977</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A radioactive material has a half life of 3 hours. If after 8 hours there are 205g left, how many grams of material were there to begin with? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #768244 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</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=768244\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Working backward in time, the amount of material doubles every half-life.<br><BR>\n" );
document.write( "8 hours is 8/3 half-lives.<br><BR>\n" );
document.write( "The number of grams of material 8 hours ago was<br><BR>\n" );
document.write( "205 * 2^(8/3)<br><BR>\n" );
document.write( "Use a calculator.... </SPAN>\n" );
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