Answer:
31.64°
Step-by-step explanation:
Since these angles are on a straight line, we know that these 2 angles add up to 180. So we can make an equation:
[tex]180 = (3x-9)+(2.5x+15)[/tex]
[tex]180 = 5.5x+6[/tex]
[tex]174 = 5.5x[/tex]
x= [tex]\frac{174}{5.5}[/tex]
x= 31.64°( to 2 d.p.)
