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Serggg [28]
3 years ago
7

10 - 13x - 7 -8x =6 need help

Mathematics
2 answers:
Levart [38]3 years ago
8 0

Answer:

x = - 1/7

Step-by-step explanation:

Simplify:

3 - 21x = 6

Subtract 3 from both sides:

-21x = 6 - 3

Simplify:

-21x = 3

Divide:

x = - 3/21

Simplify the fraction:

x = 1/7

Hope this helps ; )

EleoNora [17]3 years ago
3 0

Answer:

x = -1/7

Step-by-step explanation:

10 - 13x - 7 -8x = 6

3 - 21x= 6

-21x = 6 - 3

-21x = 3

x = -1/7

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Find the volume of the cone. Round solution to the nearest tenth when necessary
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96 in 3

Step-by-step explanation:

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brian makes an investment in his company’s stock . what does the stock chart say about the stock price today? The down arrow ind
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Step-by-step explanation:

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2 years ago
7(1 - y) = -3(y - 2)
LenaWriter [7]

Answer:

1/4

Step-by-step explanation:

Distribute.

7 - 7y = -3y + 6

Get all ys on one side

7 = 4y + 6

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5 0
3 years ago
Again ... Commute times in the U.S. are heavily skewed to the right. We select a random sample of 500 people from the 2000 U.S.
VladimirAG [237]

Answer:

We conclude that the mean commute time in the U.S. is less than half an hour.

Step-by-step explanation:

We are given that a random sample of 500 people from the 2000 U.S. Census is selected who reported a non-zero commute time.

In this sample the mean commute time is 27.6 minutes with a standard deviation of 19.6 minutes.

Let \mu = <u><em>mean commute time in the U.S..</em></u>

So, Null Hypothesis, H_0 : \mu \geq 30 minutes      {means that the mean commute time in the U.S. is more than or equal to half an hour}

Alternate Hypothesis, H_A : \mu < 30 minutes     {means that the mean commute time in the U.S. is less than half an hour}

The test statistics that would be used here <u>One-sample t-test statistics</u> as we don't know about population standard deviation;

                           T.S. =  \frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }  ~ t_n_-_1

where, \bar X = sample mean commute time = 27.6 minutes

            s = sample standard deviation = 19.6 minutes

            n = sample of people from the 2000 U.S. Census = 500

So, <u><em>the test statistics</em></u>  =  \frac{27.6 -30}{\frac{19.6}{\sqrt{500} } }  ~ t_4_9_9

                                       =  -2.738

The value of t test statistic is -2.738.

Since, in the question we are not given with the level of significance so we assume it to be 5%. <u>Now, at 5% significance level the t table gives critical values of -1.645 at 499 degree of freedom for left-tailed test.</u>

Since our test statistic is less than the critical value of t as -2.378 < -1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis.</u>

Therefore, we conclude that the mean commute time in the U.S. is less than half an hour.

4 0
3 years ago
How can Help me<br> (a+b)^2≥4ab
sattari [20]

Mark as brainlist___________________________________

5 0
3 years ago
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