Answer:
x = 60°
General Formulas and Concepts:
Pre-Algebra
- Order of Operations: BPEMDAS
- Equality Properties
Geometry
- A box on an angle signifies a 90° angle
- All angles in a triangle add up to 180°
Explanation:
Step 1: Set up equation
x° + 90° + 30° = 180°
Step 2: Solve for x
- Combine like terms: x + 120 = 180
- Subtract 120 on both sides: x = 60°