Answer:
x = 65°
Step-by-step explanation:
The 2 base interior angles are adjacent to the external angles and are supplementary.
180° - 105° = 75°
180° - 140° = 40°
The sum of the 3 interior angles of a triangle = 180°
Subtract the sum of the 2 known interior angles from 180 for x
x = 180° = (75 + 40)° = 180° - 115° = 65°
