Suppose that x and y are extended real numbers and that {xn}, {yn}, and {wn} are real

Question:

Suppose that x and y are extended real numbers and that {xn}, {yn}, and {wn} are real sequences.
a) [SQUEEZE THEOREM FOR ]. If xn → x and yn → x, as n → ∞, and xn < wn < yn for n ∊ N, prove that wn → x as n → ∞.
b) [COMPARISON THEOREM FOR ]. If xn → and yn → y as n → ∞, and xn < yn for n ∊ N, prove that x < y.