Question

Reason 1. M∠A + m∠B + m∠C = 1. 2. 28° + x − 4° + = 180° 2. Substitution 3. X = 3. Algebra

Answer 1

156°

Explanation:

Reason 1.

M∠A + m∠B + m∠C = 1.

2.

28° + x − 4° + = 180°

We collect like terms

x = 180° + 4° - 28°

x = 156°