Respuesta :

Space

Answer:

mAB = 7

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

Algebra I

  • Terms/Coefficients/Degrees

Step-by-step explanation:

Step 1: Define

Set up equation.

mAB + mBC = mAC

x + 4 + 4 = 3x + 2

Step 2: Solve for x

  1. Combine like terms:                     x + 8 = 3x + 2
  2. Isolate x terms:                             8 = 2x + 2
  3. Isolate x term:                               6 = 2x
  4. Isolate x:                                        3 = x
  5. Rewrite:                                         x = 3

Step 3: Find AB

  1. Define:                              mAB = x + 4
  2. Substitute in x:                 mAB = 3 + 4
  3. Add:                                  mAB = 7

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