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Mrrafil [7]
3 years ago
7

The area of a square is 100 m². What is its perimeter?​

Mathematics
2 answers:
puteri [66]3 years ago
7 0

Answer:

hope it helps you.........

tekilochka [14]3 years ago
4 0

Answer:

correct me if I'm wrong but 40?

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A small submarine travels at a speed of 2.4 km per hour. How far will the submarine travel in 0.25 hours
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Step-by-step explanation:

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At a recent county fair, you observed that at one stand people's weight was forecasted, and were surprised by the accuracy (with
MatroZZZ [7]

Answer:

a)Slope: \hat \beta_1 =\frac{7625.9}{1248.9}=6.106

Intercept: \hat \beta_o = 157.955 -6.106 (69.686)=-267.548

b) r=\frac{7625.9}{\sqrt{[1248.9][94228.8]}}=0.657  

And the determination coeffecient is r^2 = 0.657^2 =0.432  

Step-by-step explanation:

Data given and definitions

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.  

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"    

When we conduct a multiple regression we want to know about the relationship between several independent or predictor variables and a dependent or criterion variable.  

n=110, \sum x_i y_i = \sum (X-\bar X)(Y-\bar Y) =7625.9,\sum x^2_i=\sum (x-\bar x)^2 =1248.9 , sum y^2_i=\sum(y-\bar y)^2 =94228.8  

\sum Y_i =17375 , \sum X_i = 7665.5

Part a

The slope is given by this formula:

\hat \beta_1 =\frac{\sum (x-\bar x) (y-\bar y)}{\sum (x-\bar x )^2}

If we replace we got:

\hat \beta_1 =\frac{7625.9}{1248.9}=6.106

We can find the intercept with the following formula

\hat \beta_o = \bar y -\hat \beta_1 \bar x

We can find the average for x and y like this:

\bar X=7665.5/110 =69.686, \bar y= 17375/110=157.955

And replacing we got:

\hat \beta_o = 157.955 -6.106 (69.686)=-267.548

Part b

In order to calculate the correlation coefficient we can use this formula:  

r=\frac{\sum (x-\bar x)(y-\bar y) }{\sqrt{[\sum (x-\bar x)^2][\sum(y-\bar y)^2]}}  

For our case we have this:  

n=110, \sum x_i y_i = \sum (X-\bar X)(Y-\bar Y) =7625.9,\sum x^2_i=\sum (x-\bar x)^2 =1248.9 , sum y^2_i=\sum(y-\bar y)^2 =94228.8  

So we can find the correlation coefficient replacing like this:

r=\frac{7625.9}{\sqrt{[1248.9][94228.8]}}=0.657  

And the determination coeffecient is r^2 = 0.657^2 =0.432  

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3 years ago
natural numbers will ____ be whole numbers. Integers will ___ be natural numbers. Irrational numbers will ___ be real numbers. R
NARA [144]

- Natural numbers will Always be whole numbers.

Natural numbers are positive integers (whole numbers), so, they are always whole numbers.

- Integers will Sometimes be natural numbers.

Not all integers are natural numbers. Negative integers are not natural numbers while positive integers are natural numbers.

- Irrational numbers will Always be real numbers.

Real numbers consist of both irrational and rational numbers. So, all irrational numbers are real numbers.

- Rational numbers will Never be irrational numbers.

Rational numbers and irrational numbers are two different types of real numbers.

- Rational numbers will Sometimes be integers.

Not all rational numbers are integers. there are some rational numbers that are not integers while some rational numbers are integers.

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Which system of inequalities is represented by the graph?
sergey [27]
I believe the correct answer is the third answer.

Hope this helps! :)
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Determine the effective monthly growth rate for a population that grows at a rate of 23% each year.
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Answer:B.) 1.74%

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