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4 years ago

9

Steps for solving 4x-12=20 are shown explain how steps 3 helps the equation

2 answers:

emmasim [6.3K]4 years ago

6 0

Answer:

8

Step-by-step explanation:

4x-12=20

4x=20+12

4x=32

x=32/4

x=8

Vika [28.1K]4 years ago

4 0

Answer:

x = 8

Step-by-step explanation:

1. 4x - 12 = 20

2. Add 12 to both sides.

3. 4x - 12 =20

4. + 12 + 12

5. 4x = 32

6. Divide both sides by 4

7. $\frac{4x}{4}=\frac{32}{4}$

8. x = 8

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Firlakuza [10]

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4 years ago

Determine the pattern and fill in the missing numbers in this sequence: 1,4,7, ,13, ,19

rewona [7]

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3 years ago

Please answer all three.

sasho [114]

Answer:

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Step-by-step explanation:

Cylinder:

diameter = 6 cm

r = 6/2 = 3cm

h = 4 cm

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= 3.14 * 3 * 3 * 4

= 113.04 cm³

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= 729 cm³

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4 0

3 years ago

Read 2 more answers

What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

$0.04\sqrt{n} = 57.575$

$\sqrt{n} = 1439.375$

$\sqrt{n}^{2} = (1439.375)^{2}$

$n = 2,071,800$

We need a sample size of 2,071,800 or higher.

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3 years ago

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kobusy [5.1K]

Answer:

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Step-by-step explanation:

7 0

4 years ago

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