document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=771260>Question 771260</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain radioactive substance decays according to the<BR>\n" );
document.write( "formula m(t) = 70e^&#8722;0.062t, where m represents the mass<BR>\n" );
document.write( "in grams that remains after t years.\r<BR>\n" );
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document.write( "(a) Find the initial mass of the substance.<BR>\n" );
document.write( "(b) What percent of mass remains after 15 years?\r<BR>\n" );
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document.write( "I will really appreciate your help... Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #470078 by </B><A HREF=/tutors/aboutme.mpl?userid=oscargut><B>oscargut(2103)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oscargut><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/cgi-bin/show-face.mpl?user=oscargut><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=470078\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A certain radioactive substance decays according to the<BR>\n" );
document.write( "formula m(t) = 70e^&#8722;0.062t, where m represents the mass<BR>\n" );
document.write( "in grams that remains after t years.<BR>\n" );
document.write( "(a) Find the initial mass of the substance.<BR>\n" );
document.write( "(b) What percent of mass remains after 15 years?<BR>\n" );
document.write( "I will really appreciate your help... Thank you!\r<BR>\n" );
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document.write( "Answers:\r<BR>\n" );
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document.write( "a) m(0)= 70\r<BR>\n" );
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document.write( "Answer: 70\r<BR>\n" );
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document.write( "b) m(15)=70e^&#8722;0.062(15) = 70(0.395)\r<BR>\n" );
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document.write( "Answer: 39.5 %\r<BR>\n" );
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document.write( "You can ask me more at: mthman@gmail.com\r<BR>\n" );
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document.write( "Thanks\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );