Answer:
x = 120°
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
In Δ ADB
∠ ABD = 180° - (55 + 25)° = 180° - 80° = 100°
∠ ABD and ∠ DBC are adjacent and supplementary, thus
∠DBC = 180° - 100° = 80°
The external angle of a triangle is equal to the sum of the two opposite interior angles.
x is an exterior angle of Δ EBC, thus
x = 80° + 40° = 120°
