Answer: [tex]55^{\circ}[/tex]
Step-by-step explanation:
The measure of the third unknown arc is
[tex]360^{\circ}-70^{\circ}-110^{\circ}=180^{\circ}[/tex].
So, [tex]x=\frac{180^{\circ}-70^{\circ}}{2}=\boxed{55^{\circ}}[/tex]
