Answer:
○ 69°
Explanation:
Since you have two angle measures defined, use the Triangular Interior Angles Theorem to find the third angles measure:

180° = 30° + 39° + m∠4
|________|
180° = 69° + m∠4
-69° - 69°
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111° = m∠4
Then, since m∠4 forms a linear pair with m∠1, use the Supplementary Angles Theorem:

- 111° - 111°
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69° = m∠1
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