document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1103957>Question 1103957</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose a sales can be modelled by the sinusoidal equation:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S=200cos%28pi%2F6%29%28t%2B2%29%2B200 ALIGN=MIDDLE  ALT=\"S=200cos%28pi%2F6%29%28t%2B2%29%2B200\"   DISABLED_style= \"max-width:90%; height:auto;\" > where t is time in months with t=0 corresponding to <BR>\n" );
document.write( "January. For what month are sales equal to 0? </SPAN>\n" );
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document.write( "Presumably the equation is supposed to be<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S=200cos%28%28pi%2F6%29%28t%2B2%29%29%2B200 ALIGN=MIDDLE  ALT=\"S=200cos%28%28pi%2F6%29%28t%2B2%29%29%2B200\"   DISABLED_style= \"max-width:90%; height:auto;\" >....<br><BR>\n" );
document.write( "For the sales to be 0, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28%28pi%2F6%29%28t%2B2%29%29 ALIGN=MIDDLE  ALT=\"cos%28%28pi%2F6%29%28t%2B2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > must be -1; that means <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%2F6%29%28t%2B2%29 ALIGN=MIDDLE  ALT=\"%28pi%2F6%29%28t%2B2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > must be equal to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi ALIGN=MIDDLE  ALT=\"pi\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%2F6%29%28t%2B2%29+=+pi ALIGN=MIDDLE  ALT=\"%28pi%2F6%29%28t%2B2%29+=+pi\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28t%2B2%29%2F6+=+1 ALIGN=MIDDLE  ALT=\"%28t%2B2%29%2F6+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+4 ALIGN=MIDDLE  ALT=\"t+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "If t=0 represents January, then t=4 represents May.<br><BR>\n" );
document.write( "The equation indicates that sales are 0 in the month of May. </SPAN>\n" );
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