document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=134746>Question 134746</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The concentration of a drug in medical patients bloodstream is given by <BR>\n" );
document.write( "f(t)=5 / <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5E2%2B1 ALIGN=MIDDLE  ALT=\"t%5E2%2B1\"   DISABLED_style= \"max-width:90%; height:auto;\" > where t is greater than less than 0 is in hours and f(t) is in milligrams per liter.\r<BR>\n" );
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document.write( "a. Does the concentration of the drug increase or decrease? Justify answer<BR>\n" );
document.write( "b. The patient should not take a second dose until the concentration is below 1.5 milligrams per liter. How long should the patient wait before taking a second dose? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #98581 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=98581\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The concentration of a drug in medical patients bloodstream is given by <BR>\n" );
document.write( "f(t)=5/(t^2+1)  where t is greater than or less than 0 is in hours and f(t) is in milligrams per liter. <BR>\n" );
document.write( "a. Does the concentration of the drug increase or decrease? Justify answer<BR>\n" );
document.write( "As t increases, concentration decreases; they are indirectly related.<BR>\n" );
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document.write( "b. The patient should not take a second dose until the concentration is below 1.5 milligrams per liter. How long should the patient wait before taking a second dose?<BR>\n" );
document.write( "1.5 = 5/(t^2+1)<BR>\n" );
document.write( "1.5t^2 + 1.5 = 5<BR>\n" );
document.write( "1.5t^2 = 3.5<BR>\n" );
document.write( "t^2 = 2.3333<BR>\n" );
document.write( "t = 1.5275<BR>\n" );
document.write( "He should wait at least 1.5275 hours.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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