document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=547048>Question 547048</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the illumination produced by a light source depends on the distance from the source. For a particular light source, this relationship can be expressed as i=(4050)/(d^2), where i is the amount of illumination in footcandles and d is the distance from the light (in feet). How far from the source is the illumination equal to 50 footcandles? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #356349 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=356349\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> he illumination produced by a light source depends on the distance from the source.<BR>\n" );
document.write( " For a particular light source, this relationship can be expressed as i=(4050)/(d^2), where<BR>\n" );
document.write( " i is the amount of illumination in footcandles and<BR>\n" );
document.write( " d is the distance from the light (in feet). <BR>\n" );
document.write( "How far from the source is the illumination equal to 50 footcandles?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "50 = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4050%2Fd%5E2 ALIGN=MIDDLE  ALT=\"4050%2Fd%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply both sides by d^2<BR>\n" );
document.write( "50d^2 = 4050<BR>\n" );
document.write( "divide both sides by 50<BR>\n" );
document.write( "d^2 = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4050%2F50 ALIGN=MIDDLE  ALT=\"4050%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "d^2 = 81<BR>\n" );
document.write( "d = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2881%29 ALIGN=MIDDLE  ALT=\"sqrt%2881%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "d = 9 ft<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );