document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1117857>Question 1117857</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the net amount of e-book sales in millions of dollars can be estimated by S(t)=2.05(1.8)^t, where t is the number of years after 2002. \r<BR>\n" );
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document.write( "a) In what year was there $8 billion in e-book net sales?\r<BR>\n" );
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document.write( "b) Find the doubling time.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #733016 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</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=733016\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8=2.05%281.8%29%5Et ALIGN=MIDDLE  ALT=\"8=2.05%281.8%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=1.8%5Et=8%2F2.05 ALIGN=MIDDLE  ALT=\"1.8%5Et=8%2F2.05\"   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=1.8%5Et=3.90243 ALIGN=MIDDLE  ALT=\"1.8%5Et=3.90243\"   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%2Alog%28%281.8%29%29=log%28%283.90243%29%29 ALIGN=MIDDLE  ALT=\"t%2Alog%28%281.8%29%29=log%28%283.90243%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=log%28%283.90243%29%29%2Flog%28%281.8%29%29 ALIGN=MIDDLE  ALT=\"t=log%28%283.90243%29%29%2Flog%28%281.8%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=2.316 ALIGN=MIDDLE  ALT=\"t=2.316\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "This would be between or in years 2004\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.8%5Et=2 ALIGN=MIDDLE  ALT=\"1.8%5Et=2\"   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%2Alog%28%281.8%29%29=log%28%282%29%29 ALIGN=MIDDLE  ALT=\"t%2Alog%28%281.8%29%29=log%28%282%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=log%28%282%29%29%2Flog%28%281.8%29%29 ALIGN=MIDDLE  ALT=\"t=log%28%282%29%29%2Flog%28%281.8%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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