document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=811253>Question 811253</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Help plz!!\r<BR>\n" );
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document.write( "After a pollutant is dumped into a lake, each year the amount of pollutant is reduced by 18%. Considering the function A(t)=Ao(0.82)^t, the lake will be safe to swim in when the pollutant is reduced to 0.1Ao. After how many years will the lake be safe?\r<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 #488692 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39633)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=488692\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find t when <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.1Ao=Ao%280.82%29%5Et ALIGN=MIDDLE  ALT=\"0.1Ao=Ao%280.82%29%5Et\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.1=%280.82%29%5Et ALIGN=MIDDLE  ALT=\"0.1=%280.82%29%5Et\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=log%2810%2C0.1%29=log%2810%2C%280.82%5Et%29%29 ALIGN=MIDDLE  ALT=\"log%2810%2C0.1%29=log%2810%2C%280.82%5Et%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1=t%2Alog%2810%2C0.82%29 ALIGN=MIDDLE  ALT=\"-1=t%2Alog%2810%2C0.82%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28-1%29%2F%28log%2810%2C0.82%29%29 ALIGN=MIDDLE  ALT=\"t=%28-1%29%2F%28log%2810%2C0.82%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%281%2F0.0862%29 ALIGN=MIDDLE  ALT=\"t=%281%2F0.0862%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28t=11.6%29 ALIGN=MIDDLE  ALT=\"highlight%28t=11.6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > years </SPAN>\n" );
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