document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=739436>Question 739436</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The formula D=0.054x^2+0.058x describes the distance in feet that it takes to stop a vehicle traveling x miles per hour on dry pavement.\r<BR>\n" );
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document.write( "How fast can you drive if you wish to be able to stop your car within 65 feet? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #451212 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=451212\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The formula D=0.054x^2+0.058x describes the distance in feet that it takes to stop a vehicle traveling x miles per hour on dry pavement.<BR>\n" );
document.write( "How fast can you drive if you wish to be able to stop your car within 65 feet?<BR>\n" );
document.write( ":<BR>\n" );
document.write( ".054x^2 + .058x = 65<BR>\n" );
document.write( "A quadratic equation<BR>\n" );
document.write( ".054x^2 + .058x - 65 = 0<BR>\n" );
document.write( "Use the quadratic formula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "In this equation, a=.054, b=.058, c=-65<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-.058+%2B-+sqrt%28.058%5E2-4%2A.054%2A-65+%29%29%2F%282%2A.054%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-.058+%2B-+sqrt%28.058%5E2-4%2A.054%2A-65+%29%29%2F%282%2A.054%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-.058+%2B-+sqrt%28.003364%2B14.04+%29%29%2F%28.108%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-.058+%2B-+sqrt%28.003364%2B14.04+%29%29%2F%28.108%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-.058+%2B-+sqrt%2814.04673+%29%29%2F%28.108%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-.058+%2B-+sqrt%2814.04673+%29%29%2F%28.108%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "the positive solution is all we want here<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-.058+%2B+3.7479%29%2F%28.108%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-.058+%2B+3.7479%29%2F%28.108%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "x = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3.69%2F.108 ALIGN=MIDDLE  ALT=\"3.69%2F.108\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "x = 34.167 mph for a stopping distance of 65 ft </SPAN>\n" );
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