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adoni [48]
3 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]3 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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Peter wants to test an assumption on the number of trees that tested positive for a particular infestation. He decides to focus
LUCKY_DIMON [66]

Answer:

H0 : P ≤ 0.12

H1 : P > 0.12

Step-by-step explanation:

12% = 12/ 100 = 0.12

Given the population proportion, P = 0.12

The claim is the alternative hypothesis, H1 ; which is to test if more than 12% of trees have been infested.

Hence, the alternative hypothesis will be ;

H1 : P > 0.12

The null hypothesis which is the initial truth is always the opposite of the alternative hypothesis, Therefore, we write our null as ;

The null hypothesis ; H0 : P ≤ 0.12

Therefore, we have :

H0 : P ≤ 0.12

H1 : P > 0.12

4 0
3 years ago
Using the net below, find the surface area
polet [3.4K]

Answer:

56 cm^2

Step-by-step explanation:

Surface area is just finding the areas of each face in a figure. As we are given a net of a figure, it is much easier for us to calculate it.

Area of square base (side^2)

4^2 = 16 cm^2

Area of ONE triangular face (1/2 x b x h):

1/2 x 4 x 5 = 10 cm^2

Multiply that by 4 because we have 4 triangular faces: 10 cm^2 x 4 = 40 cm^2

ADD all the areas of triangles and square:

16 cm^2 + 40 cm^2 = 56 cm^2

HOPE THIS HELPS

Have a nice day!

4 0
3 years ago
F(x) = -2(x + 2)2 + 4
USPshnik [31]

Answer:

4x4=?        then we have 2x2=?

Step-by-step explanation: H-JJ-

7 0
3 years ago
Put in order from greatest to least: -5, -10, -1/2, -2.5, -0.25​
Sindrei [870]

Answer:

-0.25, -1/5, -2.5, -5, -10

Step-by-step explanation:

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2 years ago
Chris buys a car for $24,000. If the car loses value at a rate of 9% per year, what will it be worth in 5 years? Round to the ne
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A=p(1-r)^n
A=24,000×(1−0.09)^(5)
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