Answer:
x = 110°
Step-by-step explanation:
x + (x-10) + (x+40) = 360°
This is because angle at a point equals to 360°
Then open the brackets
x + x - 10°+ x + 40°=360°
Then collect like terms
That is;
x + x + x = 360° + 10° - 40°
Then the rest is easy
3x = 330°
x = 330°/3
x = 110°
You can go further to find each angle
x=110°
x+40= 110° + 40° = 150°
x-10= 110° - 10 =100°
Check:
100° + 150° + 110° = 360°
