document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=415951>Question 415951</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find t:<BR>\n" );
document.write( "70=5+90e^.018t </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #291516 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=291516\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find t:<BR>\n" );
document.write( "70=5+90e^.018t<BR>\n" );
document.write( "---<BR>\n" );
document.write( "65 = 90*e^0.018t<BR>\n" );
document.write( "---<BR>\n" );
document.write( "e^(0.018t) = 13/18<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Take the natural log of both sides:<BR>\n" );
document.write( "0.018t = ln(13/18)<BR>\n" );
document.write( "0.018t = -0.3254<BR>\n" );
document.write( "t = -18.079...<BR>\n" );
document.write( "====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "================= </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );