Answer:
You answer is C. 70 degrees.
Step-by-step explanation:
Since you have the two other Interior values, you know that when you add them (40+30), and then subtract it from 180, you will find that the other Interior angle is 110 degrees.
Now, an interior and exterior angle must add up to 180 degrees to be a correct angle. Since you know that the interior one is 110, you can figure out that the exterior angle will be 70 degrees.
110+x=180
110+70= 180
180=180
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