document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=204886>Question 204886</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2.	Let the equation f(x) = 1.2 ln x + 2.3 represent the wind speed in meters per second at a height x meters above the ground.  <BR>\n" );
document.write( "a.	Find the wind speed at 4 meters above ground.<BR>\n" );
document.write( "b.	Estimate the height needed to achieve a wind speed of 6 meters per second.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #154649 by </B><A HREF=/tutors/aboutme.mpl?userid=alicealc><B>alicealc(293)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=alicealc><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=154649\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (a) wind speed at 4 meters above the ground:<BR>\n" );
document.write( "f(4) = 1.2*ln(4) + 2.3 = 1.2*1.3863 + 2.3 = 1.6636 + 2.3 = 2.9636 meters per second\r<BR>\n" );
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document.write( "(b) height needed for wind speed of 6 meters per second:<BR>\n" );
document.write( "6 = 1.2*ln(x) + 2.3<BR>\n" );
document.write( "6 - 2.3 = 1.2*ln(x)<BR>\n" );
document.write( "3.7 = 1.2*ln(x)<BR>\n" );
document.write( "3.7/1.2 = ln(x)<BR>\n" );
document.write( "3.0833 = ln(x)<BR>\n" );
document.write( "x = e^3.0833 = 21.8303 meters<BR>\n" );
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