document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=326229>Question 326229</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The number of insects attracted to a bright light is currently 8. If the number is expected to quadruple every 10 minutes, how long will it take for the number to reach 500? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #233516 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=233516\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  The number of insects attracted to a bright light is currently 8. If the number is expected to quadruple every 10 minutes, how long will it take for the number to reach 500?<BR>\n" );
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document.write( "A(t) = Ao(4)^(t/10) where t is in minutes.<BR>\n" );
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document.write( "500 = 8*4^(t/10)<BR>\n" );
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document.write( "4^(t/10) = 62.5<BR>\n" );
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document.write( "Take the log and solve for \"t\":<BR>\n" );
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document.write( "(t/10)*log(4) = log62.5<BR>\n" );
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document.write( "t/10 = 2.9829<BR>\n" );
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document.write( "t = 29.98<BR>\n" );
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document.write( "Round up to t = 30 minutes<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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