document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=472217>Question 472217</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If (x^2)(y^3)z < 0, which of the following statements must be true?\r<BR>\n" );
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document.write( "I. yz < 0<BR>\n" );
document.write( "II. xz < 0<BR>\n" );
document.write( "III. xy < 0\r<BR>\n" );
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document.write( "A) I only<BR>\n" );
document.write( "B) I and II only<BR>\n" );
document.write( "C) I and III only<BR>\n" );
document.write( "D) II and III only<BR>\n" );
document.write( "E) I, II, III\r<BR>\n" );
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document.write( "Please explain how I could approach this (ie. plugging in numbers?...) and why the answer is correct.\r<BR>\n" );
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document.write( "Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #323797 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=323797\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> II and III do not have to be true, since x could be either positive or negative, and whatever sign y has, x could have that same sign, and xy > 0.\r<BR>\n" );
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document.write( "However, I has to be true. Divide both sides by (x^2)(y^2) (a positive number), and you will obtain yz < 0. </SPAN>\n" );
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