document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=189123>Question 189123</A>: <I><SPAN STYLE=\"word-break: break-all;\"> can you please help me solve this equation?!\r<BR>\n" );
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document.write( "If the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and then use the quadratic formula to solve mathematically) \r<BR>\n" );
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document.write( "a.The car was stopped when the driver applied the brakes<BR>\n" );
document.write( "b.The car was going about 12.36 miles per hour<BR>\n" );
document.write( "c.The car was going about 32.36 miles per hour<BR>\n" );
document.write( "d.There is not enough information to determine the correct answer.<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 #141864 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=141864\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ------------------<BR>\n" );
document.write( "the quadratic is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d=.05r%5E2%2Br+ ALIGN=MIDDLE  ALT=\"+d=.05r%5E2%2Br+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "If the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and then use the quadratic formula to solve mathematically) <BR>\n" );
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document.write( "d(r) = 0.05r^2+r<BR>\n" );
document.write( "20 = 0.05r^2+r<BR>\n" );
document.write( "Rearrange:<BR>\n" );
document.write( "0.05r^2 + r - 20 = 0<BR>\n" );
document.write( "Multiply thru by 100 to get rid of the decimal:<BR>\n" );
document.write( "5r^2 + 100r - 2000 = 0<BR>\n" );
document.write( "Divide thru by 5 to get:<BR>\n" );
document.write( "r^2 + 20r - 400 = 0<BR>\n" );
document.write( "Use the quadratic formula:<BR>\n" );
document.write( "r = [-20 +- sqrt(20^2 -4*-400]/2<BR>\n" );
document.write( "r = [-20 +- 44.72]/2<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "r = 12.36 mph<BR>\n" );
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document.write( "a.The car was stopped when the driver applied the brakes<BR>\n" );
document.write( "b.The car was going about 12.36 miles per hour<BR>\n" );
document.write( "c.The car was going about 32.36 miles per hour<BR>\n" );
document.write( "d.There is not enough information to determine the correct answer.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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