document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=462226>Question 462226</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 116. Grade of a Highway The grade x of a hill is a measure of the steepness and r responds to the slope of the highway. The accompanying figure shows a grade of x= 10/100 = 10% because the road rises 10 feet for every 100 feet of horizontal run. The braking distance D in feet for a car traveling 60 miles per hour on a wet uphill grade is given by<BR>\n" );
document.write( "D(x) = 3600/30x + 9\r<BR>\n" );
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document.write( "(b) Find the grade x for a braking distance of 300 feet </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #316909 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=316909\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Grade of a Highway The grade x of a hill is a measure of the steepness and r responds to the slope of the highway. The accompanying figure shows a grade of x= 10/100 = 10% because the road rises 10 feet for every 100 feet of horizontal run. The braking distance D in feet for a car traveling 60 miles per hour on a wet uphill grade is given by<BR>\n" );
document.write( "D(x) = 3600/30x + 9 <BR>\n" );
document.write( "(b) Find the grade x for a braking distance of 300 feet<BR>\n" );
document.write( "Solve: 300 = (3600/30x)+9<BR>\n" );
document.write( "291 = 3600/30x<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = 3600/(30*291)<BR>\n" );
document.write( "x = 0.4124<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============ </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );