document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=916775>Question 916775</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball on a string is pulled 6 inches below its rest position and then released. After t seconds, the ball's distance (d) in inches from its rest position is given by\r<BR>\n" );
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document.write( "d = -6cos (pi/2)t\r<BR>\n" );
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document.write( "find all values of t for which the ball is 3 inches below its rest position.\r<BR>\n" );
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document.write( "any help will be greatly appreciated. I want to have an example to work from\r<BR>\n" );
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document.write( "thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #556306 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=556306\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A ball on a string is pulled 6 inches below its rest position and then released. After t seconds, the ball's distance (d) in inches from its rest position is given by\r<BR>\n" );
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document.write( "d = -6cos (pi/2)t\r<BR>\n" );
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document.write( "find all values of t for which the ball is 3 inches below its rest position.<BR>\n" );
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document.write( "I think you mean<BR>\n" );
document.write( "d = -6cos(t*pi/2)<BR>\n" );
document.write( "-6cos(t*pi/2) = -3<BR>\n" );
document.write( "cos(t*pi/2) = 1/2<BR>\n" );
document.write( "t*pi/2 = pi/3, 5pi/3 + n*2pi, n = 0,1,2,3...<BR>\n" );
document.write( "t = 2/3, 10/3 + 4n, n = 0,1,2,3... t in seconds </SPAN>\n" );
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