document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=136382>Question 136382</A>: <I><SPAN STYLE=\"word-break: break-all;\"> PLEASE HELP WITH THIS PROBLEM FROM  BLITZER 4 COLLEGE ALGEBRA.\r<BR>\n" );
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document.write( "(1) suppose that N = sqrt x+4 models the number of cases of an infection, in millions, of a disease x years from now<BR>\n" );
document.write( " (a) approximately how many cases of the infection will there be 16  years from now?<BR>\n" );
document.write( " (b) in approximately how many years will there be 6 million cases? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #99897 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=99897\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> N is the number of millions of cases and x is the number of years.  So for part a of your problem, substitute 16 for x and do the arithmetic.  For part b, you need to solve the equation for x by squaring both sides of the equation and then subtracting 4 from both sides.  Then you can substitute 6 for N and do the arithmetic to solve for x. </SPAN>\n" );
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