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3 years ago

PLEAS HELP What is the distance between (4,7) and (5,72

Mathematics

2 answers:

Sloan [31]3 years ago

8 0

Answer:

Step-by-step explanation:

use distance formula for (4, -7) and (-5, -7)

d=√(-5-4)² +(-7+7)²=√81=9

Trava [24]3 years ago

5 0

Answer:

Step-by-step explanation:

Since the y-values are the same, you calculate the absolute value of -5 - 4. That is 9.

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Help ASAP! image below.

Sindrei [870]

Answer:

y= 68°

x= 34°

Step-by-step explanation:

78° alternates C= 78°

34+78= 112°

180-112= 68°

y alternates 68° y= 68°

68+78= 146°

180-146= 34°

3 0

3 years ago

1.What would be the points of AA'B'C' after AABC was reflected across the y-axis? A (-4,1) B (4,3) C (0,-1) 2. What would be the

Schach [20]

Answer:

B its a guess because nothing is shown

Step-by-step explanation:

6 0

3 years ago

What is the first step in solving the equation x2 - 25 = 0?

Finger [1]

Answer:

first step - make x² the subject of the formula

x² = 25

second step :

find the square root of both sides

√x² = √25

x = 5

Step-by-step explanation:

5 0

3 years ago

Draw the number line to represent.

Alekssandra [29.7K]

Answer:

Mas não reconhecida como a face da sua vida

6 0

3 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