Answer:
B.
Step-by-step explanation:
We can make this an equation because they are [tex]S.s.Int[/tex] angles
[tex](60x+30)+(9x+12)=180[/tex]
Combine like terms
[tex]69x+42=180[/tex]
Subtract 42 from both sides
[tex]69x=138[/tex]
Divide both sides by 69
[tex]x=2[/tex]
Find m∠4 & m∠6
m∠4 = [tex]60x+30[/tex] since [tex]x[/tex] equals [tex]2[/tex] we get m∠4 = 150°
m∠6 = [tex]9x+12[/tex] since [tex]x[/tex] equals [tex]2[/tex] we get m∠6 = 30°
