Respuesta :

nktselepov

the sum of the expanded angle is 180⇒

[tex]40+40+2x+30=180\\2x=70\\x=35[/tex]

stardustgirl61

Answer:

x=35

Step-by-step explanation:

Add the 2 known angles: 80°

Then subtract them from eight since a straight line is 180°: 180-80= 100

then you have the equation: 2x+30=100

2x+30=100

     -30  -30

      2x=70

       [tex]\frac{2x}{2}[/tex] =[tex]\frac{70}{2}[/tex]

        x=35