Answer:
x = 115
Step-by-step explanation:
The sum of the external angles of a polygon = 360°
The external angle of the 50° internal angle = 180° - 50° = 130°
Sum the external angles and equate to 360
130 + 45 + 70 + x = 360, that is
245 + x = 360 ( subtract 245 from both sides )
x = 115
