Question 2
Real numbers $x,$ $y,$ and $z$ satisfy the inequalities
$$
0 \lt x \lt 1, \quad -1 \lt y \lt 0,
$$ and $$
1 \lt z \lt 2.
$$
Which of the following numbers is necessarily positive?
$$
0 \lt x \lt 1, \quad -1 \lt y \lt 0,
$$ and $$
1 \lt z \lt 2.
$$
Which of the following numbers is necessarily positive?