document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1205428>Question 1205428</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A radioactive substance is decaying use the formula s=y(e raised to -0.04t) where y is initial amount and s is the amount remaining after t years. <BR>\n" );
document.write( "A.) If y = 50grams how much mass will be left after 5 years of decay<BR>\n" );
document.write( "B.) How long will it take for the mass to decay to half of the original mass (y = 50g) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #842217 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=842217\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s=ye%5E%28-0.04t%29 ALIGN=MIDDLE  ALT=\"s=ye%5E%28-0.04t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t is in years.<BR>\n" );
document.write( "y, s, in grams.\r<BR>\n" );
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document.write( "(A)<BR>\n" );
document.write( "how much still after 5 years?\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s=50%2Ae%5E%28-0.04%2A5%29 ALIGN=MIDDLE  ALT=\"s=50%2Ae%5E%28-0.04%2A5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >----------you can use the computational tool of your choice.\r<BR>\n" );
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document.write( "OR\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s=50%2Ae%5E%28-0.2%29 ALIGN=MIDDLE  ALT=\"s=50%2Ae%5E%28-0.2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >-----------and use the computational tool of your choice.\r<BR>\n" );
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document.write( "(B) Big hint<BR>\n" );
document.write( "Take natural log of both sides of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s=ye%5E%28-0.04t%29 ALIGN=MIDDLE  ALT=\"s=ye%5E%28-0.04t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > and solve for t. </SPAN>\n" );
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