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goblinko [34]
3 years ago
5

Can someone help me x-7=2x-6

Mathematics
2 answers:
Effectus [21]3 years ago
7 0
X=-1
x-7=2x-6
subtract x from both sides.
-7=x-6
add 6 on both sides.

babymother [125]3 years ago
7 0
X - 7 = 2x - 6   Add 6 to both sides
 x - 1 = 2x        Subtract x from both sides
     -1 = x          Flip it around so it's easier to read
      x = -1

Check your answer by substituting -1 in for x.

(-1) - 7 = 2(-1) - 6   Simplify 2 times -1
(-1) - 7 = -2 - 6      Simplify both sides
      -8 = -8

So, x = -1 .
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Assume that the paired data came from a population that is normally distributed. using a 0.05 significance level and dequalsxmin
Artemon [7]
"<span>Assume that the paired data came from a population that is normally distributed. Using a 0.05 significance level and d = (x - y), find \bar{d}, s_{d}, the t-test statistic, and the critical values to test the claim that \mu_{d} = 0"

You did not attach the data, therefore I can give you the general explanation on how to find the values required and an example of a random paired data.

For the example, please refer to the attached picture.

A) Find </span><span>\bar{d}
You are asked to find the mean difference between the two variables, which is given by the formula:
\bar{d} =  \frac{\sum (x - y)}{n}

These are the steps to follow:
1) compute for each pair the difference d = (x - y)
2) sum all the differences
3) divide the sum by the number of pairs (n)

In our example: 
</span><span>\bar{d} =  \frac{6}{8} = 0.75</span>

B) Find <span>s_{d}
</span><span>You are asked to find the standard deviation, which is given by the formula:
</span>s_{d} =  \sqrt{ \frac{\sum(d - \bar{d}) }{n-1} }

These are the steps to follow:
1) Subtract the mean difference from each pair's difference 
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4) divide by the degree of freedom DF = n - 1

In our example:
s_{d} = \sqrt{ \frac{101.5}{8-1} }
= √14.5
= 3.81

C) Find the t-test statistic.
You are asked to calculate the t-value for your statistics, which is given by the formula:
t =  \frac{(\bar{x} - \bar{y}) - \mu_{d} }{SE}

where SE = standard error is given by the formula:
SE =  \frac{ s_{d} }{ \sqrt{n} }

These are the steps to follow:
1) calculate the standard error (divide the standard deviation by the number of pairs)
2) calculate the mean value of x (sum all the values of x and then divide by the number of pairs)
3) calculate the mean value of y (sum all the values of y and then divide by the number of pairs)
4) subtract the mean y value from the mean x value
5) from this difference, subtract  \mu_{d}
6) divide by the standard error

In our example:
SE = 3.81 / √8
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The problem gives us <span>\mu_{d} = 0, therefore:
t = [(9.75 - 9) - 0] / 1.346</span>
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D) Find t_{\alpha / 2}
You are asked to find what is the t-value for a 0.05 significance level.

In order to do so, you need to look at a t-table distribution for DF = 7 and A = 0.05 (see second picture attached).

We find <span>t_{\alpha / 2} = 1.895</span>

Since our t-value is less than <span>t_{\alpha / 2}</span> we can reject our null hypothesis!!

7 0
3 years ago
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Will give brainliest
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Answer:

<h2> <em><u>384</u></em></h2>

Step-by-step explanation:

<em><u>Given</u></em><em><u>, </u></em>

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<em><u>Therefore</u></em><em><u>, </u></em>

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= 2( lb + bh + lh)

= 2(12 \times 9 + 9 \times 4 + 12 \times 4) {ft}^{2}

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= 2 \times 192 {ft}^{2}

= 384 {ft}^{2}

<em><u>Hence</u></em><em><u>,</u></em>

<em><u>Surface</u></em><em><u> </u></em><em><u>area</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>rectangular</u></em><em><u> </u></em><em><u>prism</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>384</u></em><em><u> </u></em><em><u>sq</u></em><em><u>.</u></em><em><u> </u></em><em><u>ft</u></em><em><u> </u></em><em><u>(</u></em><em><u>Ans</u></em><em><u>)</u></em>

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jok3333 [9.3K]
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3 years ago
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Is 2.5/3=75% equivalent
xenn [34]
Yes because I just took the test
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