document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1053000>Question 1053000</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An A.p has 15 terms and a common difference of -3 find its first and last terms if its sum  -120 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #668329 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=668329\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> S = (n/2)(2a + (n-1)d)<BR>\n" );
document.write( "-120 = 15/2 (2a + 14(-3))<BR>\n" );
document.write( "-16 = 2a - 42<BR>\n" );
document.write( "26 = 2a<BR>\n" );
document.write( "a1 = 13<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad ALIGN=MIDDLE  ALT=\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a15 = 13 + (-42)<BR>\n" );
document.write( "a15 = -29<BR>\n" );
document.write( "Checking\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2 ALIGN=MIDDLE  ALT=\"S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-120 = 15(13-29)/2   = 15(-16)/2 = -120 CHECKS<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );