document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=997592>Question 997592</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function<BR>\n" );
document.write( "b(t) = 8.1 &#8722; 2.2 cos (pi/155)t<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Not clear.<BR>\n" );
document.write( "Clarify the cosine.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "where t is measured in days.<BR>\n" );
document.write( "(a) Find the period.<BR>\n" );
document.write( " <BR>\n" );
document.write( " days\r<BR>\n" );
document.write( "\n" );
document.write( "(b) Find the maximum and minimum brightness.<BR>\n" );
document.write( " <BR>\n" );
document.write( " (minimum)<BR>\n" );
document.write( " <BR>\n" );
document.write( " (maximum)\r<BR>\n" );
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document.write( "(c) Graph the function b. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #615619 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=615619\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function<BR>\n" );
document.write( "b(t) = 8.1 &#8722; 2.2 cos (pi/155)t<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Not clear.<BR>\n" );
document.write( "Clarify the cosine.<BR>\n" );
document.write( "pi/155 is a constant.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "where t is measured in days.<BR>\n" );
document.write( "(a) Find the period.<BR>\n" );
document.write( " <BR>\n" );
document.write( " days\r<BR>\n" );
document.write( "\n" );
document.write( "(b) Find the maximum and minimum brightness.<BR>\n" );
document.write( " <BR>\n" );
document.write( " (minimum)<BR>\n" );
document.write( " <BR>\n" );
document.write( " (maximum)\r<BR>\n" );
document.write( "\n" );
document.write( "(c) Graph the function b. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );