document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=375493>Question 375493</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The intensity I of a television signal varies inversely as the square of distance d from the transmitter.  If the intensity is 25W/m^2 at a distance of 2 km, how far from the transmitter are you when the intensity is 2.6W/m^2?\r<BR>\n" );
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document.write( "Unfortunately, we did not go over this in class so I've been struggling with trying to figure it out.  I want to think the formula to start with is I = k/d^2  after that I am stumped.  I don't understand what 2.6W/m^2 represents.<BR>\n" );
document.write( "Any help would greatly be appreciated. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #267072 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=267072\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You are off to a good start!  You have written the inverse variation function for intensity (I):<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=I+=+k%2Fd%5E2 ALIGN=MIDDLE  ALT=\"I+=+k%2Fd%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now you need to find the value of k, the constant of variation.  You do this by substituting the given values of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=I+=+25 ALIGN=MIDDLE  ALT=\"I+=+25\"   DISABLED_style= \"max-width:90%; height:auto;\" >W/m^2 and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+2 ALIGN=MIDDLE  ALT=\"d+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" >meters:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25+=+k%2F2%5E2 ALIGN=MIDDLE  ALT=\"25+=+k%2F2%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > so that...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k+=+100 ALIGN=MIDDLE  ALT=\"k+=+100\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now the function for intensity looks like:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=I+=+100%2Fd%5E2 ALIGN=MIDDLE  ALT=\"I+=+100%2Fd%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now you can answer the question posed in the problem:<BR>\n" );
document.write( "\"How far (d) are you from the transmitter when the intensity (I) is 2.6W/<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5E2 ALIGN=MIDDLE  ALT=\"m%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >?<BR>\n" );
document.write( "Substitute the values into the last equation:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2.6+=+100%2Fd%5E2 ALIGN=MIDDLE  ALT=\"2.6+=+100%2Fd%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Solve for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5E2 ALIGN=MIDDLE  ALT=\"d%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5E2+=+100%2F2.6 ALIGN=MIDDLE  ALT=\"d%5E2+=+100%2F2.6\"   DISABLED_style= \"max-width:90%; height:auto;\" > Take the square root of both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+10%2Fsqrt%282.6%29 ALIGN=MIDDLE  ALT=\"d+=+10%2Fsqrt%282.6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >meters.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+6.2 ALIGN=MIDDLE  ALT=\"d+=+6.2\"   DISABLED_style= \"max-width:90%; height:auto;\" >meters. <BR>\n" );
document.write( "Intensity is Watts per square meter or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=W%2Fm%5E2 ALIGN=MIDDLE  ALT=\"W%2Fm%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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