document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=871163>Question 871163</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have to do the following question: <BR>\n" );
document.write( "\"At rest, the human heart beats once every second. At the strongest part of the<BR>\n" );
document.write( "beat, a person’s blood pressure peaks at 120mmHg. At the most relaxed part<BR>\n" );
document.write( "of the beat, a person’s blood pressure drops to 80mmHg. Supposing that t = 0<BR>\n" );
document.write( "corresponds to the peak of the beat, write down a trigonometric function that<BR>\n" );
document.write( "captures this behaviour. Sketch the blood pressure over two heart beats.\" <BR>\n" );
document.write( "What I have used is a cosine function, because the graph begins at the max and it's easier to use a cosine function.<BR>\n" );
document.write( "My formula is 100+20cos(t(2pi)) <BR>\n" );
document.write( "Amplitude: (120-80)/2 = 20<BR>\n" );
document.write( "Period - 1 sec = 2pi / 1 = 2pi<BR>\n" );
document.write( "Max = 120<BR>\n" );
document.write( "Min = 80<BR>\n" );
document.write( "Vertical shift (and midline) = Max - amp = 120-20 = 100 <BR>\n" );
document.write( "Can someone please tell me if I have done this correctly. I just need the correct formula to do the graph. <BR>\n" );
document.write( "Thanks in advance, <BR>\n" );
document.write( "Zerinadee </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #525374 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=525374\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Yes, your equation is correct.<BR>\n" );
document.write( "Sine or cosine, it doesn't matter, they are the same curve only phase shifted. <BR>\n" );
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