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3 years ago

7

Five tables and eight chairs cost $115; three tables and five chairs cost $70. Determine the cost of each table and of each chai

r. PLEASE HELP

1 answer:

stiks02 [169]3 years ago

4 0

$75

Step by step explanation:

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Solve 4x^2 + 43 = 120. Round to the nearest hundredth.

Lady bird [3.3K]

4x² + 43 = 120
4x² = 120 - 43
4x² = 77
x² = 77/4
x² = 19.25
x = ±√19.25
x = ±4.39
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The solutions are ±4.39</span>

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3 years ago

I have 72 truffles in 8 days how many days will it take to get 99 truffles

ikadub [295]

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4 years ago

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4 years ago

Suppose that a researcher is planning a new study on hemoglobin levels amongst women under 25 years old. Previous research sugge

Mariulka [41]

Answer:

A sample size of at least 531 is required.

Step-by-step explanation:

We are lacking the confidence level to solve this question, so i am going to use a 90% confidence level.

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, 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.

Find the required sample size for the new study.

A sample size of at least n is required.

n is found when $M = 0.05$

We have that $\sigma = 0.7$

So

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

$0.05 = 1.645*\frac{0.7}{\sqrt{n}}$

$0.05\sqrt{n} = 1.645*0.7$

$\sqrt{n} = \frac{1.645*0.7}{0.05}$

$(\sqrt{n})^{2} = (\frac{1.645*0.7}{0.05})^{2}$

$n = 530.4$

Rounding up

A sample size of at least 531 is required.

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3 years ago

In the above diagram, which of the following pairs of angles are NOT adjacent?<br><br><br>

SpyIntel [72]

The answer is C. b and d.

Adjacent means next to each other.

hope this helps !

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3 years ago