is Z and f are on the right of 0.dferm wrote:Please Help...
Statement I
zf is positive
z could be negative
f could be negative
or
z could be positive
f could be positive
Insufficient.
Statement II
z+f = positive
z positive and f negative
z>f
z+(-f)=positive
f>z
f positive and z negative
-z+f= positive
Insufficient.
Combining I & II
zf=positive
z+f=positive
Therefore both are positive. Hence C is the answer.
