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3 years ago

Its middle school math i need help

Mathematics

2 answers:

ziro4ka [17]3 years ago

8 0

Answer:

x=3

Step-by-step explanation:

4x + 2 = x + 11

subtract 2 and x from both sides

3x = 9

divide by 3 on both sides

x = 3

skad [1K]3 years ago

5 0

Answer:

x = 3

Step-by-step explanation:

4x+2 = x+11

Subtract x from each side

4x+2-x = x+11-x

3x+2 =11

Subtract 2 from each side

3x+2-2 =11-2

3x = 9

Divide by 3

3x/3 =9/3

x = 3

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If a person blinks their eyes once every 3 minutes on the average, then how many times

Paha777 [63]

Answer:

480

Step-by-step explanation:

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3 years ago

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Scrat [10]

Answer:

Down below, look at the explanation, those are the answers.

Step-by-step explanation:

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8 0

3 years ago

Suppose a production facility purchases a particular component part in large lots from a supplier. The production manager wants

musickatia [10]

Answer:

We need a sample size of at least 1161.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error for the interval is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.22$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

How large a sample should she take?

We need a sample size of at least n.

n is found when $M = 0.02$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.02 = 1.645\sqrt{\frac{0.22*0.78}{n}}$

$0.02\sqrt{n} = 1.645\sqrt{0.22*0.78}$

$\sqrt{n} = \frac{1.645\sqrt{0.22*0.78}}{0.02}$

$(\sqrt{n})^{2} = (\frac{1.645\sqrt{0.22*0.78}}{0.02})^{2}$

$n = 1160.88$

Rounding up

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3 years ago

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Thepotemich [5.8K]

Answer:

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Step-by-step explanation:

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3 years ago