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3 years ago

Will give brainliest!

Mathematics

2 answers:

OLEGan [10]3 years ago

6 0

Answer:

-(10)2 simply does not equal -102

Step-by-step explanation:

-(10)2

Remove unnesessary parenthesis and put a multiplication symbol between the two numbers.

-10 x 2

Multiplying a negative and a posotive equals a negative.

-20

andre [41]3 years ago

3 0

Answer:

The values are -20 and -102.

Difference is 82.

Step-by-step explanation:

-2(10) = -20.

Difference is -20 - (-102)

= -20 + 102

= 82.

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Solve each system by elimnination. 5c- 4t= 8 14 + 4t = 3c

VladimirAG [237]

The answer is c=11 and t=11.75 :)

Here’s the explanation of why and why it is correct

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3 years ago

Is there more than one way to get 2/3/4/5 to the simplest form

seropon [69]

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3 years ago

F n and m are integers and n2 m2 is even, which of the following is impossible?

iren2701 [21]

So, I think that you mean that

n²+m² is even? (the "plus" sign is missing, but I think this is correct).

this can only happen if either:

both n and m are even
or
both n and m are odd

That's because a sum of two expressions is even if either both or none of the expressions summed is even, and a power of a number is even only if the number is even too.

are those some of the options?

yes!
n and m are even,- possible!
n and m are odd, -possible!
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so the option we'll choose is:

none of these are impossible

6 0

4 years ago

There were 350 members in the high school marching band last year. This year, the number of marching band members increased by 5

PIT_PIT [208]

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3 years ago

Read 2 more answers

The health of the bear population in a park is monitored by periodic measurements taken from anesthetized bears. A sample of the

Vikki [24]

Answer:

$182.167-2.03\frac{114.05}{\sqrt{36}}=143.580$

$182.167+2.03\frac{114.05}{\sqrt{36}}=220.754$

So on this case the 95% confidence interval would be given by (143.580;220.754)

Step-by-step explanation:

Assuming the following dataset:

77, 349,417,349, 167 , 225, 265, 360,205

145,335,40,139, 177,108, 163, 202, 22

123,439, 125,135, 86,43, 217,49, 156

119,178, 151, 61, 350, 312, 91, 89,89

We can calculate the sample mean with the followinf formula:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}= 182.167$

And the sample deviation with:

$s = \sqrt{\frac{\sum_{i=1}^n (X_i-\bar X)^2}{n-1}}=114.05$

The sample size on this case is n =36.

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".

$\bar X=182.167$ represent the sample mean

$\mu$ population mean (variable of interest)

s=114.05 represent the sample standard deviation

n=36 represent the sample size

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

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

The point estimate of the population mean is $\hat \mu = \bar X =182.167$

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

$df=n-1=36-1=35$

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(0.025,35)".And we see that $t_{\alpha/2}=2.03$

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

$182.167-2.03\frac{114.05}{\sqrt{36}}=143.580$

$182.167+2.03\frac{114.05}{\sqrt{36}}=220.754$

So on this case the 95% confidence interval would be given by (143.580;220.754)

5 0

3 years ago