Answer:
∠ DBC = 60°
Explanation:
Since BD bisects ∠ ABC , then
∡ ABD = ∠ DBC , substitute values
4x = 2x + 30 ( subtract 2x from both sides )
2x = 30 ( divide both sides by 2 )
x = 15
Then
∠ DBC = 2x + 30 = 2(15) + 30 = 30 + 30 = 60°
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