Given that $x < 0 < y$, I. $y - x ^ { - 1 }$ II. $x ^ { 2 } + y ^ { - 1 }$ III. $( x \cdot y ) ^ { - 1 }$ Which of these expressions have negative values? A) Only I B) Only II C) Only III D) I and III E) II and III
Given that $x < 0 < y$,\\
I. $y - x ^ { - 1 }$\\
II. $x ^ { 2 } + y ^ { - 1 }$\\
III. $( x \cdot y ) ^ { - 1 }$\\
Which of these expressions have negative values?\\
A) Only I\\
B) Only II\\
C) Only III\\
D) I and III\\
E) II and III