document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=339231>Question 339231</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the nth term formula for the given arithmetic sequence; 9,7,5,3.... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #243147 by </B><A HREF=/tutors/aboutme.mpl?userid=alanc><B>alanc(27)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=alanc><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=alanc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=243147\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> look at each term:  from 9 to 7  we see a difference of -2<BR>\n" );
document.write( "from 7 to 5 we see a difference of -2<BR>\n" );
document.write( "Therefore the common difference d = -2\r<BR>\n" );
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document.write( "first term a = 9\r<BR>\n" );
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document.write( "nth term should be describe as a_n = a + d*(n-1)\r<BR>\n" );
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document.write( "formula :  a_n = 9 + -2*(n-1)\r<BR>\n" );
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document.write( "makes sense because the 2nd term 7 = 9 -2 *(2-1) = 7<BR>\n" );
document.write( "try it out.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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