what is the perimeter of polygon of (-4, 7), (6, 7), 6,- 2), (-8, -2), (-8, 3), (-4, 3) please help I don’t understand!

Halp xD I took away the ones that I did

FinnZ [79.3K]

4. is 46
8. is 438 dimes
9. is 3.099, 3.289, 3.644, 3.9
10. is .4868

3 0

3 years ago

Which set is closed under subtraction?

Genrish500 [490]

Answer:

C. The set of rational numbers

Step-by-step explanation:

Don't listen to the other person. I trusted them and got the answer wrong. I just got the question and guessed the second time. I fortunately got the answer right. Good luck! :) <3

6 0

3 years ago

Read 2 more answers

Determine which absolute value function represents this graph.

Valentin [98]

Answer: A

Step-by-step explanation:

4 0

2 years ago

The endpoints of AB are A(0, 0) and B(6, 8)

dezoksy [38]

We are given the endpoints. We are also given the endpoints after the transformation. For the first item, a simple distance formula verification would reveal that the distance between AB and A'B' is not equal. So, a dilation must have been done. Next, AB and A'B' are not parallel which means that a translation transformation must have been done.
After a dilation of 4/5 with A as the center, A' is still (0,0) and B' is (6 - 24/5, 8 - 32/5).

5 0

2 years ago

An article presents measures of penetration resistance for a certain fine-grained soil. Fifteen measurements, expressed as a mul

balu736 [363]

Answer:

$2.64-2.14\frac{1.32}{\sqrt{15}}=1.911$

$2.64+2.14\frac{1.32}{\sqrt{15}}=3.369$

So on this case the 95% confidence interval would be given by (1.911;3.37)

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".

$\bar X=2.64$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s=1.32 represent the sample standard deviation

n=15 represent the sample size

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)

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

$df=n-1=15-1=14$

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 table to find the critical value. The excel command would be: "=-T.INV(0.025,14)".And we see that $t_{\alpha/2}=2.14$

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

$2.64-2.14\frac{1.32}{\sqrt{15}}=1.911$

$2.64+2.14\frac{1.32}{\sqrt{15}}=3.369$

So on this case the 95% confidence interval would be given by (1.911;3.37)

6 0

3 years ago