Question

Solve for x (geometry)

Answer 1

Answer:

x = -6°

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets

1. Parenthesis
2. Exponents
3. Multiplication
4. Division
5. Addition
6. Subtraction

• Left to Right  

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtraction Property of Equality

Algebra I

• Terms/Coefficients

Geometry

• All angles in a triangle add up to 180°

Step-by-step explanation:

Step 1: Define

Identify and set up

x + 81 + 65° + 40° = 180°

Step 2: Solve for x

1. [Addition] Combine like terms:                                                                        x + 186° = 180°
2. [Subtraction Property of Equality] Subtract 186° on both sides:                   x = -6°