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2 years ago

Help plz I don't understand

Mathematics

1 answer:

prohojiy [21]2 years ago

6 0

Question 2 answer is 6
Question 3 answer is 4
Question 4 answer is 6
Question 5 answer is 4

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How do I solve x+4y=22 -x+5y=23

xxTIMURxx [149]

{ x + 4y = 22 ( + x - x = 0 )
{ - x + 5y = 23

4y + 5y = 22 + 23
9y = 45
y = 45 
9
y = 5

x + 4y = 22
x + 4 . 5 = 22
x + 20 = 22
x = 22 - 20
x = 2

S = { 2 , 5 }

3 0

2 years ago

Read 2 more answers

For the following paired data, (1) Calculate the correlation coefficient, r, and (2) at the 0.05 significance level, determine w

expeople1 [14]

Answer:

Linear correlation exists

Step-by-step explanation:

Given the data :

X : | 2 4 5 6

Y : | 6 9 8 10

Using technology to fit the data and obtain the correlation Coefficient of the regression model,

The Correlation Coefficient, r is 0.886

To test if there exists a linear correlation :

Test statistic :

T = r / √(1 - r²) / (n - 2)

n = number of observations

T = 0.886 / √(1 - 0.886²) / (4 - 2)

T = 0.866 / 0.3535845

T = 2.449

Comparing Pvalue with α

If Pvalue < α ; Reject H0

Pvalue = 0.1143

α = 0.05

Pvalue > α ; We reject the null and conclude that linear correlation exists

7 0

2 years ago

9a-4(2a+5). I really need help with this question

slava [35]

First you had to expanded form.

$-4(2a+5)=-8a-20$

$9a-8a-20$

Finally you can also add by similar to elements.

$9a-8a=a$

$a-20$

Final answer: $\boxed{=a-20}$

Hope this helps!

And thank you for posting your question at here on brainly, and have a great day.

-Charlie

8 0

2 years ago

Please let me know the answer to this

matrenka [14]

I think it’s number 2 sorry if it’s wrong!!

6 0

2 years ago

What is 15 5/7+3/7? i need help!

kobusy [5.1K]

Answer:

16 1/7

Step-by-step explanation:

simple add

start with the fractions

5/7+3/7 = 8/7

simplify 1 1/7

add your whole numbers 15+1= 16 and the add your fraction 16+1/7= 16 1/7

8 0

2 years ago