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Answer:
∠4 = 45°
Explanation:
Angles 2 and 4 are in the northwest corner of the intersection of the transversal and the parallel lines. That means they are corresponding angles, and so are congruent.
∠2 = ∠4
2x +15 = x +30 . . . . substitute the given expressions
x = 15 . . . . . . . . subtract x+15
∠4 = x+30 = 15 +30
∠4 = 45°