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adoni [48]
2 years ago
14

5x - 7 + 2x = 21 solve the linear and state the property that justifies your first step

Mathematics
1 answer:
Debora [2.8K]2 years ago
4 0

Answer:

x = 4

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

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

Equality Properties

Step-by-step explanation:

<u>Step 1: Define equation</u>

5x - 7 + 2x = 21

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Combine like terms:                    7x - 7 = 21
  2. Add 7 on both sides:                   7x = 28
  3. Divide 7 on both sides:               x = 4
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Please help 7th grade math question? URGENT! awarding brainliest!
Ivenika [448]

correct Option is B i.e, 72x^2+288x^2-216x whose simplified form is: 360x^2-216x

Step-by-step explanation:

We need to solve the expression:

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Solving:

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So, correct Option is B i.e, 72x^2+288x^2-216x whose simplified form is: 360x^2-216x

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