Answer:
B. 180°−p+m
Step-by-step explanation:
The angle on the other side of n, call it N, is 180 - n
N = 180 -n
The angle on the other side of p, call it P, is 180 - p
P = 180 -p
The angle inside the triangle opposite m is the same as m because it is a vertical angle and vertical angles are equal.
We are looking to find the angles inside the triangle, because we know they add to 180 degrees
N+P+m = 180
(180-n) + (180-p) +m = 180
Combine like terms
360 -n-p+m = 180
Add n to each side
360 -n+n-p+m = 180+n
360 -p+m = 180+n
Subtract 180 from each side
360-180 -p+m =180-180+n
180+m-p =n