Answer:
50
Step-by-step explanation:
The sum of a triangle's angles are 180 so since you know one angle is 80, you would put 2x + 80 = 180, which would be 2x = 100, which simplifies to x = 50
m=25/12
multiply the reciprocal of 2/5 on both sides
Plus a negative value becomes subtraction:
-12 + -23 = -12 -23 = -35
