Answer:
x = 10
General Formulas and Concepts:
Pre-Algebra
- Order of Operations: BPEMDAS
- Equality Properties
Geometry
- All angles in a triangle add up to 180°
Step-by-step explanation:
Step 1: Set up equation
(x + 1)° + (10x - 7)° + (8x - 4)° = 180°
Step 2: Solve for x
- Combine like terms: 19x - 10 = 180
- Isolate x term: 19x = 190
- Isolate x: x = 10
