document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1181059>Question 1181059</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the partial sum formula to find the partial sum of the given arithmetic sequence. ( Sn =  n/2 ( a1 + an)  )\r<BR>\n" );
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document.write( "Find the sum of the first four terms of the arithmetic sequence: 7, 15, 23, . . . .\r<BR>\n" );
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document.write( "a. 60<BR>\n" );
document.write( "b. 45<BR>\n" );
document.write( "c. 152<BR>\n" );
document.write( "d. 76 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #810934 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=810934\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "Use the partial sum formula to find the partial sum of the given arithmetic sequence. ( Sn =  n/2 ( a1 + an)  )\r<BR>\n" );
document.write( "\n" );
document.write( "Find the sum of the first four terms of the arithmetic sequence: 7, 15, 23, . . . .\r<BR>\n" );
document.write( "\n" );
document.write( "a. 60<BR>\n" );
document.write( "b. 45<BR>\n" );
document.write( "c. 152<BR>\n" );
document.write( "d. 76<BR>\n" );
document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">You don't have to find the 4th term as that woman did. But, even if you wanted to, just add 8 to the 3rd term 23,<BR>\n" );
document.write( "to get the 4th term, 31. Is there any RIDICULOUS and UNNECESSARY calculation this woman has NEVER done? <BR>\n" );
document.write( "Using what was provided, the formula, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%282a%5B1%5D+%2B+%28n+-+1%29d%29%29 ALIGN=MIDDLE  ALT=\"matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%282a%5B1%5D+%2B+%28n+-+1%29d%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > becomes: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28matrix%283%2C3%2C+S%5B4%5D%2C+%22=%22%2C+%284%2F2%29%282%287%29+%2B+%284+-+1%298%29%2C+S%5B4%5D%2C+%22=%22%2C+2%2814+%2B+3%288%29%29%2C+S%5B4%5D%2C+%22=%22%2C+2%2814+%2B+24%29%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "                                                Sum of 1st four terms or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28matrix%281%2C5%2C+S%5B4%5D%2C+%22=%22%2C+2%2838%29%2C+%22=%22%2C+76%29%29 ALIGN=MIDDLE  ALT=\"highlight_green%28matrix%281%2C5%2C+S%5B4%5D%2C+%22=%22%2C+2%2838%29%2C+%22=%22%2C+76%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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