Answer:
[tex]x + 1 + x + 3 = 180[/tex]
by vertically opposite angle theorem
[tex]x + x + 1 + 3 = 180[/tex]
[tex]2x + 4 = 180[/tex]
[tex]2x = 180 - 4 = 176[/tex]
[tex]x = \frac{176}{2} [/tex]
[tex]x = 88[/tex]
have a nice day
