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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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Greatest common factor of 18,36 and 45
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Answer:

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Step-by-step explanation:

List out the factors of the three numbers.

18: 1, 2, 3, 6, 9, 18

36: 1, 2, 3, 4, 6, 9, 12, 18, 36

45: 1, 3, 5, 9, 15, 45

The largest number that all three of these lists share is 9, so 9 is the GCF.

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Answer:

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A project on Kickstarter.com was aiming to raise $15000 for a precision coffee press. They ended up with 714 supporters, raising
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For this, we can set up a proportion.
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Our expression would be x=$15000*557% divided by 100%, which would be $83550, so... a lot of money.

(we did an “x” formation with the proportion, ie “connected” x with 100, and “connected” 15k and 557. The number connecting to x is what we divide the equation by, and the other two are multiplied and then divided by the first number connecting to x. Otherwise we couldve calculated 557% of 15000 and gotten the same result. Whichever way is easier for you :) )
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