document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1145656>Question 1145656</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An amphitheater has a number of rows with 30 seats in the first row, 32 in the second, 34 in the third and so on.\r<BR>\n" );
document.write( "\n" );
document.write( "The question is: How many rows should be there to get 3950 seats? <BR>\n" );
document.write( "--<BR>\n" );
document.write( "I know that the formula to get the number of seats in a row is Sn(n/2)(a1+1n). But I'm struggling to figure out a formula to figure out how many rows there are given the number of seats.\r<BR>\n" );
document.write( "\n" );
document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #766917 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=766917\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );