document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=44019>Question 44019</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The amount of a radioactive tracer remaining after t days is given by A=Ao e^-0.18t, where Ao is the starting amount at the beginning of the time period.  How much should be acquired now the have 40 grams remaining after 3 days?<BR>\n" );
document.write( "A. 47.9 gm<BR>\n" );
document.write( "B. 48.8 gm<BR>\n" );
document.write( "C. 61.6 gm<BR>\n" );
document.write( "D. 68.6 gm\r<BR>\n" );
document.write( "\n" );
document.write( "Another brainbuster, any help out there? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #28949 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=28949\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The amount of a radioactive tracer remaining after t days is given by A=Ao e^-0.18t, where Ao is the starting amount at the beginning of the time period. How much should be acquired now the have 40 grams remaining after 3 days?\r<BR>\n" );
document.write( "\n" );
document.write( "A=Ao e^-0.18t<BR>\n" );
document.write( "40 = Ao e^-0.18(3)<BR>\n" );
document.write( "40 = Ao (0.58274825...)<BR>\n" );
document.write( "Ao=68.64 grams\r<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );