document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1072934>Question 1072934</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, I need help on this question please :\r<BR>\n" );
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document.write( "A Canada Post outlet in  small Alberta town found that the number of pieces of mail received per week, m, can be modelled by the function \r<BR>\n" );
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document.write( "         m (t) = 3200 cos(0.72 t - 1.15) + 6400<BR>\n" );
document.write( "Where t is the number of years since January 1,2005\r<BR>\n" );
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document.write( "For how many of the first 10 years, to the nearest tenth of a year did the Canada Post outlet receive fewer than 6600 pieces of mail per week? \r<BR>\n" );
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document.write( "This falls within trigonometry function and graphing. I tried the question by plugging in 10 for t and 6600 for m(t) and got 0.7 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #687819 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=687819\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> No, you need to find when the value of the function was less than 6600.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%28t%29%3C6600 ALIGN=MIDDLE  ALT=\"m%28t%29%3C6600\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3200cos%280.72t-1.15%29%2B6400%3C6600 ALIGN=MIDDLE  ALT=\"3200cos%280.72t-1.15%29%2B6400%3C6600\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3200cos%280.72t-1.15%29%3C200 ALIGN=MIDDLE  ALT=\"3200cos%280.72t-1.15%29%3C200\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%280.72t-1.15%29%3C0.0625 ALIGN=MIDDLE  ALT=\"cos%280.72t-1.15%29%3C0.0625\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So find the times when the value of the cosine function is equal to 0.0625,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.72t-1.15=1.5083 ALIGN=MIDDLE  ALT=\"0.72t-1.15=1.5083\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.72t=2.658 ALIGN=MIDDLE  ALT=\"0.72t=2.658\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=3.692 ALIGN=MIDDLE  ALT=\"t=3.692\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.72t-1.15=4.775 ALIGN=MIDDLE  ALT=\"0.72t-1.15=4.775\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.72t=5.925 ALIGN=MIDDLE  ALT=\"0.72t=5.925\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=8.229 ALIGN=MIDDLE  ALT=\"t=8.229\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/display-illustration.mpl?tutor=Fombitz&illustration_name=fr31.JPG\">.<BR>\n" );
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document.write( "So between t=3.7 years and t=8.2 years, the number of pieces of mail fell below 6600. </SPAN>\n" );
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