ANSWER:
1st option: 69°
STEP-BY-STEP EXPLANATION:
The exterior angle is equal to the sum of the two interior angles different from any interior angle supplementary to this exterior angle.
Therefore, in this case we know these two angles, so we calculate angle 1, like this:
m<1 = 39° + 30°
m<1 =69°
The correct answer then the 1st option: 69°
