If mno < 0 and no > 0, which of the following must be positive?  Choose the correct answer:	A) xy	B) xz	C) (m^2)no	D) m(n^2)o	E) xy(z^2)
Given that no is positive and mno is negative, you can say that m MUST be negative. As for n and o either they are both positive or both negative.   Option (C) has m^2 which is positive and no which is positive. So ((m^2)no) must be positive.
<result>C</result>
If mno < 0 and no > 0, which of the following must be positive?