document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=113784>Question 113784</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0131953648/algebrahomeworkh>Blitzer </A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I need some help with this word problem.  Word problems always stump me!!\r<BR>\n" );
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document.write( "Suppose that N=the square root of x plus 3 models the number of cases of an infection, in millions, of a disease x years from now. a)Approximately how many cases of the infection will there be 9 years from now? b)In approximately how many years will there be 5 million cases.  <BR>\n" );
document.write( "is this the equation?  N=x^2(+3)  if so, where does the 5 million figure in this ?<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 #82802 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=82802\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that N=the square root of x plus 3 models the number of cases of an infection, in millions, of a disease x years from now.<BR>\n" );
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document.write( "Your formula could be either N(x) = sqrt(x)+3 or it could be<BR>\n" );
document.write( "N(x) = sqrt(x+3)<BR>\n" );
document.write( "I'm going to guess that it is the latter.<BR>\n" );
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document.write( "a)Approximately how many cases of the infection will there be 9 years from now?<BR>\n" );
document.write( "N(9) = sqrt(9+3) = sqrt(12) = 2sqrt3 million<BR>\n" );
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document.write( " b)In approximately how many years will there be 5 million cases.<BR>\n" );
document.write( "5 = sqrt(x+3)<BR>\n" );
document.write( "Square both sides to get:<BR>\n" );
document.write( "25 = x+3<BR>\n" );
document.write( "x = 22 years (You will have 5 million cases in 22 years)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
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