document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1030965>Question 1030965</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A scientist has 68 grams of a radioactive substance that decays at an exponential rate. Assuming k = -0.4, how many grams of radioactive substance remain after 10 days (use continuous growth/decay)?\r<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 #645682 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=645682\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  A scientist has 68 grams of a radioactive substance that decays at an exponential rate. Assuming k = -0.4, how many grams of radioactive substance remain after 10 days.<BR>\n" );
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document.write( "A(t) = P*e^(-0.4t)<BR>\n" );
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document.write( "A(10) = 68*e^(-4) = 1.25 grams<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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