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3 years ago

Help please please help ASAP ASAP please I need help with this ASAP ASAP please

Mathematics

1 answer:

skelet666 [1.2K]3 years ago

8 0

Answer:

times 5/4

Step-by-step explanation:

7 x = 35/4

x = (35/4) / 7

x = (35/4) x (1/7)

x = 35/28

x = 5/4

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What is the solution of the system of equations? Y=-3x+8 Y=-5x+2

olganol [36]

Answer:

x=-3 y=17 (-3;17)

Step-by-step explanation:

-3x+8-y=0

-5x+2-y=0

-2x-6=0

So: x=-3

While....by substituting: y=17

3 0

3 years ago

1 2/5 multiplied by 3 4/5

tekilochka [14]

1 2/5 = 7/5
3 4/5 = 19/5
7/5 * 19/5 = 133/25 = 5.32

8 0

4 years ago

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Complete the sentence below. The standard deviation of the sampling distribution of x overbarx, denoted sigma Subscript x overb

ella [17]

Answer:

The standard deviation of the sampling distribution of x overbarx, denoted sigma Subscript x overbarσx, is called the standard error of the mean . The standard deviation of the sampling distribution of x overbarx, denoted sigma Subscript x overbarσx, is called the standard distribution of the sample.

Step-by-step explanation:

The standard error (SE) of a statistic is the standard deviation of its sampling distribution or an estimate of that standard deviation. It is called the standard error of the mean (SEM) if the parameter or the statistic is the mean.

4 0

4 years ago

Researchers are interested if a school breakfast program leads to taller children. Assume that the population of all 5 year-old

DedPeter [7]

Answer:

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

Step-by-step explanation:

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".

$\bar X=39$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=1$ represent the population standard deviation

n=25 represent the sample size

Solution to the problem

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

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

The margin of error is given by:

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

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$

And replacing we got:

$ME= 1.96 *\frac{1}{\sqrt{25}}= 0.392$

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

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

7 0

3 years ago

the equation d=1/2n (n-3) gives the number of diagonals D for polygon with n sides. use this equation to find the number of side

alekssr [168]

To solve this problem you must apply the proccedure shown below:

1. You have that:

- The equation d=1/2(n(n-3)) gives the number of diagonals for the polygon.

- The polygon that has 65 diagonals..

2. When you clear n, you obtain:

d=n(n-3)/2
d=(n^2-3n)/2
2x65=n^2-3n
n^2-3n-130=0

3. When you solve the quadratic equation, you obtain:

n=13

Therefore, the answer is: 13 sides.

3 0

3 years ago

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