Answer:
65°
Explanation:
Angles in any quadrilateral add up to 360
So we can make a equation:
[tex]360 = 2(18b-11)+2(9b+2)[/tex]
[tex]360=36b-22+18b+4[/tex]
[tex]360=54b-18[/tex]
[tex]378 = 54b[/tex]
[tex]b = \frac{378}{54}[/tex]
b= 7
So now you substitute b with 7 to give you:
[tex]9(7)+2[/tex]
[tex]63+2[/tex]
65°
