document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=598645>Question 598645</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Iodine-131 is used to find leaks in water pipes. It has a half life of 8.14 days. Write the exponential decay function for a 200 mg sample. Find the amount of Iodine 131 remaining after 72 days.<BR>\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 #378670 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=378670\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Iodine-131 is used to find leaks in water pipes. <BR>\n" );
document.write( "It has a half life of 8.14 days. Write the exponential decay function for a 200 mg sample. <BR>\n" );
document.write( "---------<BR>\n" );
document.write( "A(t) = 200*(1/2)^(t/8.14)<BR>\n" );
document.write( "-----\r<BR>\n" );
document.write( "\n" );
document.write( "Find the amount of Iodine 131 remaining after 72 days.<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "A(72) = 200(1/2)^(72/8.14)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "= 200*0.0022<BR>\n" );
document.write( "==========<BR>\n" );
document.write( "= 0.4349 mg<BR>\n" );
document.write( "=========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=========================\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );