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3 years ago

Please help, need answer fast!

Mathematics

1 answer:

Svetlanka [38]3 years ago

8 0

Instead of plugging in $m=-2$ and $n=4$ right away, notice that

$m^2-2mn+n^2=(m-n)^2$

and now evaluating this expression at the two given values is easier, if only a little:

$((-2)-4)^2=(-6)^2=(-1)^2\times6^2=1\times36=36$

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Factor out the GCF 56x^2? + 16x + 64

ycow [4]

I’m not 100% sure but I think it’s 4 for the gcf

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2 years ago

What is 8blank7 hundred divided by 4 equal

Gnoma [55]

$\frac{870}{4} = \frac{435}{2} 
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(Decimal: 217.5)

For if its
$\frac{8700}{4}$

Then is $=2175$

~ Hope this helps

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2 years ago

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adoni [48]

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2 years ago

A geologist examines 14 geological samples for iron concentration. The mean iron concentration for the sample data is 0.181 cc/c

kykrilka [37]

Answer:

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

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, find 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.

$M = 1.645*\frac{0.0318}{\sqrt{14}} = 0.0140$

The lower end of the interval is the sample mean subtracted by M. So it is 0.181 - 0.0140 = 0.167 cc/m³.

The upper end of the interval is the sample mean added to M. So it is 0.181 + 0.0140 = 0.195 cc/m³.

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

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3 years ago

The Sun hits a 30 foot flagpole at a 60° angle and casts an unobstructed 52 foot shadow. If a building is built 32 feet away, wh

Over [174]

11.5 Not sure but it should be the answer!!

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2 years ago

Read 2 more answers