document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=860707>Question 860707</A>: <I><SPAN STYLE=\"word-break: break-all;\"> pat designed a patio consisting of 16 rows of congruent slate tiles. the number of tiles in the rows form an arithmetic sequence. the first row contains 15 tiles and the last row contains 30 tiles. how many tiles are used in the deck? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #518659 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=518659\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> S = ½(a1 + an)n<BR>\n" );
document.write( "S = ½(15 + 30)16<BR>\n" );
document.write( "S=8*45<BR>\n" );
document.write( "s=360 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );