document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=79522>Question 79522</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I really need help with this one. I am trying to plug in numbers and i am not getting it.<BR>\n" );
document.write( "The amount of a radioactive tracer remaining ater t days is given by A=Aoe^-0.18t, where Ao is the starting amount at the beginning of the time period. How much should be acquired now to 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( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #57096 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=57096\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The amount of a radioactive tracer remaining ater t days is given by A=Aoe^-0.18t, where Ao is the starting amount at the beginning of the time period. How much should be acquired now to have 40 grams remaining after 3 days?<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "40 = Aoe^(-0.18*3)<BR>\n" );
document.write( "40 = Ao e^(-0.54)<BR>\n" );
document.write( "Ao = 40/e^(-0.54)<BR>\n" );
document.write( "Ao = 40/0.582748...<BR>\n" );
document.write( "Ao = 68.64 grams (this needs to be the beginning amount)<BR>\n" );
document.write( "===========<BR>\n" );
document.write( "cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );