document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=420163>Question 420163</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If a pyramid is made up of a stack of blocks in which each of the 10 layers in the stack has 10 fewer blocks in it than the layer under it, how many blocks are there in the pyramid if the top layer has 4 blocks? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #293645 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=293645\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is an arithmetic sequence with the following parameters:<BR>\n" );
document.write( "n = 10 (the number of layers)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%5B10%5D+=+4 ALIGN=MIDDLE  ALT=\"a%5B10%5D+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" > (the number of blocks in the topmost layer)<BR>\n" );
document.write( "d = -10 (the next higher layer has 10 fewer blocks)\r<BR>\n" );
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document.write( "Now <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%5B10%5D+=+a%5B1%5D+%2B+%28n-1%29d ALIGN=MIDDLE  ALT=\"a%5B10%5D+=+a%5B1%5D+%2B+%28n-1%29d\"   DISABLED_style= \"max-width:90%; height:auto;\" > ==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4+=+a%5B1%5D+%2B+9%2A-10 ALIGN=MIDDLE  ALT=\"4+=+a%5B1%5D+%2B+9%2A-10\"   DISABLED_style= \"max-width:90%; height:auto;\" > ==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%5B1%5D+=+94 ALIGN=MIDDLE  ALT=\"a%5B1%5D+=+94\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+%28n%2F2%29%2A%28a%5B1%5D+%2B+a%5Bn%5D%29+=+%2810%2F2%29%2894+%2B+4%29+=+490 ALIGN=MIDDLE  ALT=\"S+=+%28n%2F2%29%2A%28a%5B1%5D+%2B+a%5Bn%5D%29+=+%2810%2F2%29%2894+%2B+4%29+=+490\"   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
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