document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=853131>Question 853131</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball is dropped from a height of 40 feet and bounces back 90% of its previous height on each successive bounce. How far will the ball have traveled by the time it comes to a stop?\r<BR>\n" );
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document.write( "i got the equation: a sub n = 40(1-.9^n/.1) <BR>\n" );
document.write( "i do not know how to find n or if this is even the right equation </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #515128 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=515128\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 40 = t * .9<BR>\n" );
document.write( "0 >= 40 * .9^(n - 1)<BR>\n" );
document.write( "Mathematically, it never reaches zero.<BR>\n" );
document.write( "1/12 >= 40 * .9^(n - 1)<BR>\n" );
document.write( "n=60<BR>\n" );
document.write( "S=t*(1 - r^n)/(1 - r)<BR>\n" );
document.write( "S=40*(1 - .9^60)/(1 - .9)<BR>\n" );
document.write( "S = 399.281<BR>\n" );
document.write( "It approaches 400.<BR>\n" );
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