document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=185684>Question 185684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you solve a geomtric mean when the first term is 81, and the fifth term is 16? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #139274 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=139274\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do you solve a geomtric mean when the first term is 81, and the fifth term is 16?<BR>\n" );
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document.write( "Form: a(n) = ar^(n-1)<BR>\n" );
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document.write( "a = 81<BR>\n" );
document.write( "a(5) = ar^(5-1) = 16<BR>\n" );
document.write( "a(5) = 81*r^4 = 16<BR>\n" );
document.write( "r^4 = 16/81<BR>\n" );
document.write( "r = 2/3<BR>\n" );
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document.write( "Geometric sequence:<BR>\n" );
document.write( "81, (2/3)81, (2/3)^2*81, (2/3)^3(81) ...\r<BR>\n" );
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document.write( "81, 54, 36, 24, 16<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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