document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=990551>Question 990551</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you put the numbers 3,8,18,38,78 in arithmetic formula?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #610606 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=610606\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3, 8, 18, 38, 78<BR>\n" );
document.write( "begin by calculating the difference between the numbers in the given arithmetic sequence<BR>\n" );
document.write( "5, 10, 20, 40<BR>\n" );
document.write( "note that these are multiples of 5, therefore<BR>\n" );
document.write( "Xn = Xn-1 + 5*(2^(n-2))\r<BR>\n" );
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