Respuesta :

Space

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°

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