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2 years ago

When solving negative one over five (x − 25) = 7, what is the correct sequence of operations?

Mathematics

2 answers:

Andre45 [30]2 years ago

7 0

Answer:

Step-by-step explanation:

(x − 25) = 7

+25 +25

x = 32

5x + 15 = 28

-15 -15

5x = 13

/5 /5

x= 13/5

(4x + 15)=24

-15 -15

4x = 9

/4 /4

x= 2 1/4

srry thats all Im going to do I suggest you use M a t h w a y it gives step by step explanations and it solves em for ya

olga nikolaevna [1]2 years ago

5 0

1) 1/5 (x-25) = 7
1/5x - 5 = 7
Add five to both sides
1/5x = 12
Divide both sides by 1/5
x = 60

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A survey was conducted in the United Kingdom, where respondents were asked if they had a university degree. One question asked,

katovenus [111]

Answer:

$z=\frac{0.121-0.0892}{\sqrt{0.101(1-0.101)(\frac{1}{373}+\frac{1}{639})}}=1.620$

$p_v =2*P(Z>1.620)=0.105$

If we compare the p value and using any significance level for example $\alpha=0.05$ always $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can say the the two proportions are not statistically different at 5% of significance

Step-by-step explanation:

Data given and notation

$X_{1}=45$ represent the number of correct answers for university degree holders

$X_{2}=57$ represent the number of correct answers for university non-degree holders

$n_{1}=373$ sample 1 selected

$n_{2}=639$ sample 2 selected

$p_{1}=\frac{45}{373}=0.121$ represent the proportion of correct answers for university degree holders

$p_{2}=\frac{57}{639}=0.0892$ represent the proportion of correct answers for university non-degree holders

z would represent the statistic (variable of interest)

$p_v$ represent the value for the test (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to check if the proportions are different between the two groups, the system of hypothesis would be:

Null hypothesis: $p_{1} = p_{2}$

Alternative hypothesis: $p_{1} \neq p_{2}$

We need to apply a z test to compare proportions, and the statistic is given by:

$z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}$ (1)

Where $\hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{45+57}{373+639}=0.101$

Calculate the statistic

Replacing in formula (1) the values obtained we got this:

$z=\frac{0.121-0.0892}{\sqrt{0.101(1-0.101)(\frac{1}{373}+\frac{1}{639})}}=1.620$

Statistical decision

For this case we don't have a significance level provided $\alpha$ , but we can calculate the p value for this test.

Since is a one side test the p value would be:

$p_v =2*P(Z>1.620)=0.105$

7 0

3 years ago

∆ABC is isosceles, AB = BC, and CH is an altitude. How long is AC, if CH = 84 cm and m∠HBC = m∠BAC +m∠BCH?

son4ous [18]

I think I could help you
Have fun and feel free to ask me something new.
Or we can prove some properities without calculating by details

3 0

3 years ago

A suppose price per person for an event. If 17 people sign up. And the price per person is 213 what will be the price per person

Alex787 [66]

Answer:

338.28

Step-by-step explanation:

If 17 people sign up the price is 213

We want to khow the price if 27 people sign up

So:

17=> 213

27=> x( the unkhown price)

x= (27*213)/17 = 338.28

3 0

3 years ago

Read 2 more answers

Hot dog buns come in package of 8.for school picnic, mr bught 30 packge of hot dog buns how many hot dog buns did he buy? A,24,b

Oliga [24]

It is 240 because 8 bags of hot dog buns plus 30 packages of hot dog buns would equal 240.

8 0

3 years ago

Find the value of c that makes each trinomial a perfect square.<br> x^2-13x+c

vova2212 [387]

Answer:

169/4

Step-by-step explanation:

x² - 13x + c

x² -2(x)(13/2) +(13/2)²

(13/2)² = 169/4 or 42 ¼

8 0

3 years ago