1462 divided by 58<br><br> To mixed number

I NEED HELP ASAP!<br><br> 7x-3y= 6; х= 3

marysya [2.9K]

Answer:

If you are looking for y it's 5

Step-by-step explanation:

Plug in 3 for x

7(3) -3y = 6

21 - 3y = 6

subtract 21 from both sides

-3y = - 15

divide by three from both sides

y = 5

6 0

3 years ago

The cost of Internet access. How much do users pay for Internet service? Here are the monthly fees (in dollars) paid by a random

Ivanshal [37]

Answer:

$20.9-2.01\frac{7.65}{\sqrt{50}}=18.73$

$20.9+2.01\frac{7.65}{\sqrt{50}}=23.07$

The 95% confidence interval would be given by (18.73;23.07)

Step-by-step explanation:

Assuming these data

20 40 22 22 21 21 20 10 20 20

20 13 18 50 20 18 15 8 22 25

22 10 20 22 22 21 15 23 30 12

9 20 40 22 29 19 15 20 20 20

20 15 19 21 14 22 21 35 20 22

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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".

Solution to the problem

The confidence interval for the mean is given by the following formula:

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

First we need to find the sample mean with the following formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{50}=20.9$

And in order to find the sample standard deviation we can use the following formula:

$s= \sqrt{\frac{\sum_{i=1}^n (x_i -\bar x)^2}{n-1}}=7.65$

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=50-1=49$

Since the Confidence is 0.95or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,49)".And we see that $t_{\alpha/2}=2.01$

Now we have everything in order to replace into formula (1):

$20.9-2.01\frac{7.65}{\sqrt{50}}=18.73$

$20.9+2.01\frac{7.65}{\sqrt{50}}=23.07$

So on this case the 95% confidence interval would be given by (18.73;23.07)

8 0

3 years ago

Find what x is: 1/2x+4=-12

Tcecarenko [31]

Answer:

-32

Step-by-step explanation:

7 0

2 years ago

Problem:

mestny [16]

Answer:

Can you redo the question

Step-by-step explanation:

The question doesn't make no since

3 0

3 years ago

Please Help Thank You :)

olganol [36]

Considering the area of the right triangle, it is found that Salome used a scale factor of 1/2 to go from triangle R to triangle T.

<h3>What is the area of a right triangle?</h3>

The area of a right triangle is given by half the multiplication of the lengths of it's sides.

In this figure, we have that the sides have lengths of 4 and 5 units, hence the area is given by:

A = 0.5 x 4 x 5 = 10 square units.

The area is one fourth of the area of triangle R. Since we are dealing with an area, that works in squared units, the scale factor is given by:

S = sqrt(1/4) = 1/2.

Hence Salome used a scale factor of 1/2 to go from triangle R to triangle T.

More can be learned about the area of a right triangle at brainly.com/question/28230160

#SPJ1

5 0

2 years ago

1462 divided by 58 To mixed number