document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=233313>Question 233313</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The number S of ant species in Kyle Canyon, Nevasa, can be modeled by the function S=-0.000013<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+E%5E2+ ALIGN=MIDDLE  ALT=\"+E%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > + 0.042E - 21 where E is the elevation (in meters). Predict the elevation(s) at which you would expect to find 10 species of ants. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #172207 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=172207\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The number S of ant species in Kyle Canyon, Nevasa, can be modeled by the function S=-0.000013 E^2  + 0.042E - 21 where E is the elevation (in meters). Predict the elevation(s) at which you would expect to find 10 species of ants.<BR>\n" );
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document.write( "-0.000013 E^2  + 0.042E - 21 = 10<BR>\n" );
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document.write( "-0.000013 E^2  + 0.042E - 31 = 0<BR>\n" );
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document.write( "Solve for E using the quadratic formula<BR>\n" );
document.write( "and accepting only the positive solution.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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