document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=434828>Question 434828</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how can i find when the co2 ppm will double the preindustrial age of 280ppm<BR>\n" );
document.write( "with 2000 being x=0 2001 is = to 1 and so on untill 2200<BR>\n" );
document.write( "in the year 2000 co2 ppm 364 and 2050 is 467 and 2100 is 600ppm, 2150 is 769 and 2200 is 987<BR>\n" );
document.write( "with F(x)= Ca^x  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #301105 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=301105\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> how can i find when the co2 ppm will double the preindustrial age of 280ppm<BR>\n" );
document.write( "with 2000 being x=0 2001 is = to 1 and so on untill 2200<BR>\n" );
document.write( "in the year 2000 co2 ppm 364 and 2050 is 467 and 2100 is 600ppm, 2150 is 769 and 2200 is 987<BR>\n" );
document.write( "with F(x)= Ca^x<BR>\n" );
document.write( "------<BR>\n" );
document.write( "F(0) = C*1 = 364<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "F(50) = Ca^50 = 467<BR>\n" );
document.write( "---<BR>\n" );
document.write( "The a^50 = 467/364<BR>\n" );
document.write( "a = 1.004996<BR>\n" );
document.write( "----<BR>\n" );
document.write( "So your equation is <BR>\n" );
document.write( "F(x) = 364*1.004996^x<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Doubling occurs when 1.004006^x = 2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve for \"x\":<BR>\n" );
document.write( "x = log(2)/log(1.004996)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Solve:<BR>\n" );
document.write( "x = 139.09 years<BR>\n" );
document.write( "========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=================<BR>\n" );
document.write( " <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );