NO FILES I really need this one correct plz and thank you.

Answer:
[tex]x=20[/tex]°
Step-by-step explanation:
→ [tex]x+100+3x=180[/tex]
→ [tex]4x+100=180[/tex]
→ [tex]4x=180-100[/tex]
→ [tex]4x=80[/tex]
→ [tex]x=\frac{80}{4}=20[/tex]
[tex]x=20[/tex]°
[tex]---------[/tex]
hope it helps...
have a great day!!