If ay > 0 and yz < 0, which of the following must be negative:
Choose the correct option.
A) ayz  B) ay(z^2)  C) a(y^2)z  D) x(y^2)(z^2)  E) (x^2)(y^2)(z^2)
ay &gt; 0 means that ay is positive.   yz &lt; 0 means that yz is negative.   a(y^2)z = (ay)(yz) = positive*negative = negative. Thus option a(y^2)z is always negative.
<result>C</result>
If ay > 0 and yz < 0, which of the following must be negative: