document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890324>Question 890324</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sample of radioactive substance decayed according to y=100(10)^-0.4x<BR>\n" );
document.write( "where y was the mass in grams and x was the time in hours after the original measurement.<BR>\n" );
document.write( "(a) How much was present at the original measurement? (Hint: Let x=0.)<BR>\n" );
document.write( "(b) How much was in the sample to the nearest gram after 3 hours?<BR>\n" );
document.write( "(c] How much was present to the nearest gram after 5 hours? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538988 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</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=538988\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The formula should really be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=100%2810%29%5E%28-0.4x%29 ALIGN=MIDDLE  ALT=\"y=100%2810%29%5E%28-0.4x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Just substitute the given values of x to answer (a), (b), and (c).<BR>\n" );
document.write( "Table of common logarithms or scientific calculator are the tools to use\r<BR>\n" );
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document.write( "Using (b) as example, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=100%2A10%5E%28-0.4%2A3%29 ALIGN=MIDDLE  ALT=\"y=100%2A10%5E%28-0.4%2A3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=100%2A10%5E%28-1.2%29 ALIGN=MIDDLE  ALT=\"y=100%2A10%5E%28-1.2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=100%2A6.303%2A%2810%5E%28-2%29%29 ALIGN=MIDDLE  ALT=\"y=100%2A6.303%2A%2810%5E%28-2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=6.3 ALIGN=MIDDLE  ALT=\"y=6.3\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
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