Answer:
All angles of a triangle add up to 180°.
there m1+m2+m3=180°
35+75+m3=180
110°+m3=180°
m3=180°-110°
m3=70°
Answer is A.
m3 should be 70°
all internal angles of a triangle add up to 180
180-35-75 = 70
A
Step-by-step explanation:
Just add both matrices
