document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=768188>Question 768188</A>: <I><SPAN STYLE=\"word-break: break-all;\"> can someone help me please????\r<BR>\n" );
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document.write( "In testing a certain machined part, it is found that the number of failures, F, increases with hours of use, h, according to the equation F=8.69*ln[h] + 20. Find the number of hours of use which leads to 75 failures.<BR>\n" );
document.write( "Hours of use (nearest integer): 		 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #468134 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39623)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=468134\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=F=8.69%2Aln%28h%29+%2B+20 ALIGN=MIDDLE  ALT=\"F=8.69%2Aln%28h%29+%2B+20\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Want h when F is known.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=F-20=8.69%2Aln%28h%29 ALIGN=MIDDLE  ALT=\"F-20=8.69%2Aln%28h%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%28h%29=%28F-20%29%2F8.69 ALIGN=MIDDLE  ALT=\"ln%28h%29=%28F-20%29%2F8.69\"   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=highlight%28h=e%5E%28%28F-20%29%2F8.69%29%29 ALIGN=MIDDLE  ALT=\"highlight%28h=e%5E%28%28F-20%29%2F8.69%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now assign 75 to F.  Compute h.\r<BR>\n" );
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document.write( "In case the code tagging and highlighting interfere, that formula is<BR>\n" );
document.write( "h=e^((F-20)/8.69) </SPAN>\n" );
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