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3 years ago

For each question circle the best choice.

Mathematics

2 answers:

svlad2 [7]3 years ago

8 0

The answer is going 5 - 2x = 3

pogonyaev3 years ago

8 0

5x+4-2x là biểu thức đại số

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the answer is 18/18 which is the first one

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2 years ago

What is the algebraic expression for "the difference between seven times a number and three times that number"?

inna [77]

Answer:

7x-3x = 4x?

I think

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3 years ago

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2 years ago

Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoc

Bingel [31]

Answer:

We need a sample size of at least 719

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

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.

How large a sample size is required to vary population mean within 0.30 seat of the sample mean with 95% confidence interval?

This is at least n, in which n is found when $M = 0.3, \sigma = 4.103$ . So

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

$0.3 = 1.96*\frac{4.103}{\sqrt{n}}$

$0.3\sqrt{n} = 1.96*4.103$

$\sqrt{n} = \frac{1.96*4.103}{0.3}$

$(\sqrt{n})^{2} = (\frac{1.96*4.103}{0.3})^{2}$

$n = 718.57$

Rouding up

We need a sample size of at least 719

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3 years ago

A student used four different tape measures to estimate the length of a meterstick manufactured to he exactly 1 meter. Which mea

Ksju [112]

Out of the four options,
A. 99 cm B. 105.98 cm C. 90 cm D. 104.5 cm,

option A is the correct answer.

Because 1 m = 100 cm and this is the nearest approximation. Thus, the<span>A student used A tape measures to estimate the length of a meterstick manufactured to he exactly 1 meter. </span>

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3 years ago