document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=850798>Question 850798</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Dante is making a necklace with 18 rows of tiny beads in which the number of beads per row is given by the series 3 + 10 + 17 + 24 + ....<BR>\n" );
document.write( "A) use summation notation to write the series. Explain what the numbers in the summation notation represent in this situation and how you found the expression used in the summation. <BR>\n" );
document.write( "B) find the total number of beads in the necklace. Explain your method for finding the total number of beads.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #512733 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=512733\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a)<BR>\n" );
document.write( "an = a1 + (n - 1)d<BR>\n" );
document.write( "Sn=1/2(a1+an)n<BR>\n" );
document.write( "S = ½(2a1 + d(n-1))n<BR>\n" );
document.write( "b)<BR>\n" );
document.write( "S = ½(23 + 7(17))18<BR>\n" );
document.write( "S = 1278<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );