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2 years ago

ANSWER ASAP PLZ BRAINLYIST WILL BE GIVEN IF RIGHT What is the value of x?

Mathematics

2 answers:

Nonamiya [84]2 years ago

5 0

14 or 12? Just a guess

lina2011 [118]2 years ago

4 0

Answer:

8 × $x$ = 12 x 18

8 $x$ = 216

$x$ = 27cm

Step-by-step explanation:

I use that formula because they are similar triangles! :)

Hope this helps!

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Suppose that the population of the scores of all high school seniors who took the SAT Math (SAT-M) test this year follows a Norm

Vlad1618 [11]

Answer:

Confidence = $1-\alpha=1-0.01=0.99$

And then the confidence level would be given by 99%

Step-by-step explanation:

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Assuming the X follows a normal distribution

$X \sim N(\mu, \sigma)$

The distribution for the sample mean is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$\bar x =512$ represent the sample mean

$\sigma=100$ represent the population standard deviation

n= 100 sample size selected.

The confidence interval is given by this formula:

$\bar X \pm z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$ (1)

The marginof error for this case is given by Me=25.76. And we know that the formula for the margin of error is given by:

$Me=z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

$25.76=z_{\alpha/2} \frac{100}{\sqrt{100}}$

And we can find the critical value $z_{\alpha/2}$ like this:

$z_{\alpha/2}=\frac{25.76(\sqrt{100})}{100}=2.576$

And we know that on the right tail of the z score =2.576 we have $\alpha/2$ of the total area. We can find the area on the right of the z score using this excel code:

"=1-NORM.DIST(2.576,0,1,TRUE)" or using a table of the normal standard distribution, and we got 0.004998= $\alpha/2$ , so then $\alpha=0.00498*2=0.009995 \approx 0.01$ , and then we can find the confidence like this:

Confidence = $1-\alpha=1-0.01=0.99$

And then the confidence level would be given by 99%

8 0

3 years ago

Pentagon OPQRS is shown on the coordinate plane below:

sertanlavr [38]

Answer:

Multiply the coordinates of point P by the scale factor 7/4 to get the coordinates of P'.

Given : P(-5,3)

P' (x,y) = P (-5 x 7/4 , 3 x 7/4)

= P(-8.75, 5.25)

Step-by-step explanation:

8 0

3 years ago

Luisa is a deep-sea diver. Today she descended to a depth below -21 feet. What phrase describes the distance of Luisa’s dive?

Bingel [31]

Answer:

its B

Step-by-step explanation:

she went deeper than 21 feet so greater than 21

8 0

2 years ago

Simplify (2x + 3)(x – 4) = ?

Lina20 [59]

Use the FOIL method (first, outside, inside, last) to multiply:

2x^2-8x+3x-12

This can be simplified even more into:

2x^2-5x-12.

Hope this helped!

5 0

3 years ago

A department store is having a 55% off sale on all sport coats. If you have a coupon for an additional 10% off of any item, how

guajiro [1.7K]

Answer:

93.15

Step-by-step explanation:

Multiply 230.00 dollars and 0.55 = 126.50

Subtract 230.00 dollars and 126.50 = 103.50

Multiply 103.50 and 0.10 = 10.35

Subtract 103.50 and 10.35 = 93.15

8 0

3 years ago

Read 2 more answers