If ghi < 0 and hi > 0, which of the following must be positive?	Select the correct option
A) xy
B) xz
C) (g^2)hi
D) g(h^2)i
E) xy(z^2)
Given that hi is positive and ghi is negative, you can say that g MUST be negative. As for h and i either they are both positive or both negative.   Option (C) has g^2 which is positive and hi which is positive. So ((g^2)hi) must be positive.
<result>C</result>
If ghi < 0 and hi > 0, which of the following must be positive?