document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=873396>Question 873396</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Strontium-90 has a half-life of 29 years. How long will it take for an initial sample of 10mg to decay to 1mg? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #526852 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=526852\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Q(t) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+Q%5B0%5De%5E%28-kt+%29 ALIGN=MIDDLE  ALT=\"+Q%5B0%5De%5E%28-kt+%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Find k<BR>\n" );
document.write( "ln(.5)/-29 = k = .0239<BR>\n" );
document.write( "Then<BR>\n" );
document.write( " <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%28.1%29%2F%28-.0239%29 ALIGN=MIDDLE  ALT=\"ln%28.1%29%2F%28-.0239%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = t </SPAN>\n" );
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