document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1007977>Question 1007977</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The relation d=0.0052s^2 + 0.13s models the stopping distance, d, in metres, of a car travelling at a speed of s, in kilometres per hour, when the driver breaks hard. At what speed was a car travelling if its stopping distance is 20m? Round to the nearest tenth. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #623765 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20849)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=623765\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  \r<BR>\n" );
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document.write( "we are given <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=0.0052s%5E2+%2B+0.13s ALIGN=MIDDLE  ALT=\"d=0.0052s%5E2+%2B+0.13s\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=20m ALIGN=MIDDLE  ALT=\"d=20m\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "the equation becomes<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.0052s%5E2+%2B+0.13s+-+20+=+0 ALIGN=MIDDLE  ALT=\"0.0052s%5E2+%2B+0.13s+-+20+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > and we will use the following quadratic formula to solve it for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s ALIGN=MIDDLE  ALT=\"s\"   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=s+=+%28-0.13+%2B-+sqrt%280.13%5E2+-+4%2A0.0052%2A%28-20%29%29%29+%2F+%282%2A0.0052%29 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+%2B-+sqrt%280.13%5E2+-+4%2A0.0052%2A%28-20%29%29%29+%2F+%282%2A0.0052%29\"   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=s+=+%28-0.13+%2B-+sqrt%280.0169+%2B+0.416%29%29+%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+%2B-+sqrt%280.0169+%2B+0.416%29%29+%2F0.0104\"   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=s+=+%28-0.13+%2B-+sqrt%280.4329%29%29+%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+%2B-+sqrt%280.4329%29%29+%2F0.0104\"   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=s+=+%28-0.13+%2B-+0.6579513659838393%29+%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+%2B-+0.6579513659838393%29+%2F0.0104\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "solutions:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%28-0.13+%2B+0.6579513659838393%29+%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+%2B+0.6579513659838393%29+%2F0.0104\"   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=s+=0.5279513659838393%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=0.5279513659838393%2F0.0104\"   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=s+=50.76455442152301 ALIGN=MIDDLE  ALT=\"s+=50.76455442152301\"   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=s+=50.8 ALIGN=MIDDLE  ALT=\"s+=50.8\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "or<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%28-0.13+-+0.6579513659838393%29+%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=+%28-0.13+-+0.6579513659838393%29+%2F0.0104\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=-0.7879513659838393%2F0.0104 ALIGN=MIDDLE  ALT=\"s+=-0.7879513659838393%2F0.0104\"   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=s+=-75.76455442152300961538461 ALIGN=MIDDLE  ALT=\"s+=-75.76455442152300961538461\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=-75.8 ALIGN=MIDDLE  ALT=\"s+=-75.8\"   DISABLED_style= \"max-width:90%; height:auto;\" >...disregard negative solution\r<BR>\n" );
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document.write( "and your solution is:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s=+50.8%28km%2Fh%29 ALIGN=MIDDLE  ALT=\"s=+50.8%28km%2Fh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );