document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157950>Question 1157950</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Lualailua Hills Quadrangle of the East Maui (Haleakala) volcano on the island of<BR>\n" );
document.write( " Maui in Hawaii is no longer active. To find out the date of the last eruption, scientists<BR>\n" );
document.write( " conducted a chemical analysis of samples from the volcano area. The samples<BR>\n" );
document.write( " contained approximately 62% of its original carbon-14. How long ago was the last<BR>\n" );
document.write( " eruption of the volcano? Use 5730 years for the half-life of carbon-14.<BR>\n" );
document.write( " Work must be shown!<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 #780879 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=780879\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> P=Poe^(-kt)<BR>\n" );
document.write( "P/Po=1/2=e^(-kt)<BR>\n" );
document.write( "-ln2=-kt<BR>\n" );
document.write( "k=ln2/t<BR>\n" );
document.write( "=0.693/5730<BR>\n" );
document.write( "=0.000121\r<BR>\n" );
document.write( "\n" );
document.write( "P/Po=0.62=e^(-0.000121*t)<BR>\n" );
document.write( "ln(0.62)=-0.000121*t<BR>\n" );
document.write( "t=3950.71 years </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );