Answer:
x=97
Step-by-step explanation:
first find the angle measure to the right of 139
180-139=41
the sum of a triangles angles must be 180
so 180-42-41=x
97
To find the exterior angle would be to add the other 2 interior angles.
(42+x=139) so to find x you would just have to subtract the interior from the exterior. (139-42=x or 97)
