document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1090675>Question 1090675</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hi can someone please help? thanks<BR>\n" );
document.write( "A 300 g sample of thorium-234 has a half-life of 24 days. The mass of thorium, in grams, that remains  after t days can be modelled by m(t)=300(1/2)^t/24 . What mass will remain after 31 days?<BR>\n" );
document.write( "a. 122.5 g<BR>\n" );
document.write( "b. 150 g<BR>\n" );
document.write( "c. 177.5 g<BR>\n" );
document.write( "d. 193.75 g<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 #705140 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=705140\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font color=\"black\" face=\"times\" size=\"3\"><BR>\n" );
document.write( "Plug in t = 31 and use a calculator to evaluate.\r<BR>\n" );
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document.write( "m(t)=300(1/2)^(t/24)<BR>\n" );
document.write( "m(31)=300(1/2)^(31/24)<BR>\n" );
document.write( "m(31)=122.543658993082<BR>\n" );
document.write( "m(31)=122.5\r<BR>\n" );
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document.write( "You'll have <font color=red>122.5 grams</font> of thorium left over after 31 days.<BR>\n" );
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