document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1140195>Question 1140195</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A radioactive substance decays according to A=A0e−0.0048t, where A0 is the initial amount and t is the time in years.  If A0=580 grams, find the time for the radioactive substance to decay to 405 grams.  Round your answer to two decimal places, if necessary. </SPAN>\n" );
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document.write( "<s>A=A0e−0.0048t</s> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=A%5Bo%5De%5E%28-0.0048t%29 ALIGN=MIDDLE  ALT=\"A=A%5Bo%5De%5E%28-0.0048t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, where A0 is the initial amount and t is the time in years.  If A0=580 grams, find the time for the radioactive substance to decay to 405 grams.<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%28A%29=ln%28A%5Bo%5D%29%2Bln%28e%5E%28-0.0048t%29%29 ALIGN=MIDDLE  ALT=\"ln%28A%29=ln%28A%5Bo%5D%29%2Bln%28e%5E%28-0.0048t%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=ln%28A%29=ln%28A%5Bo%5D%29-0.0048t ALIGN=MIDDLE  ALT=\"ln%28A%29=ln%28A%5Bo%5D%29-0.0048t\"   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=ln%28A%29-ln%28A%5Bo%5D%29=-0.0048t ALIGN=MIDDLE  ALT=\"ln%28A%29-ln%28A%5Bo%5D%29=-0.0048t\"   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=ln%28A%5Bo%5D%29-ln%28A%29=0.0048t ALIGN=MIDDLE  ALT=\"ln%28A%5Bo%5D%29-ln%28A%29=0.0048t\"   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=%28ln%28A%29-ln%28A%5Bo%5D%29%29%2F0.0048 ALIGN=MIDDLE  ALT=\"t=%28ln%28A%29-ln%28A%5Bo%5D%29%29%2F0.0048\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "This is as a formula.  You substitute the given values and evaluate. </SPAN>\n" );
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