If N Is an Integer, N · 180° Represents an Integer

Multiple Choice

If n is an integer, n · 180° represents an integer multiple of 180°, and (2n + 1) · 90° represents an odd integer multiple of
90°. Decide whether the expression is equal to 0, 1, -1, or is undefined.
-Lines m and n are parallel.
$a = ( 4 x + 10 ) ^ { \circ }$
$b = ( 5 x + 143 ) ^ { \circ }$

A) $3 ^ { \circ } , 177 ^ { \circ }$
B) $87 ^ { \circ } , 93 ^ { \circ }$
C) $\circ 172 ^ { \circ }$
D) $22 ^ { \circ } , 158 ^ { \circ }$