Answer:
19) x=21
20) x=22
21) m∠1=70°
Step-by-step explanation:
19)
[tex]5x+75=180[/tex]
[tex]5x=105[/tex]
[tex]x=21[/tex]
20)
[tex]90+68+x=180[/tex]
[tex]x+158=180[/tex]
[tex]x=22[/tex]
21)
Because ∠1 and ∠3 are vertical, they are also congruent.
m∠3=m∠1=70°
