Answer:
∠ D = 94°
Explanation:
the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
∠ CBY is an exterior angle of the triangle, then
∠ C + ∠ D = ∠ CBY , that is
49° + ∠ D = 143° ( subtract 49° from both sides )
∠ D = 94°