-3x + 2y = 7<br> What is the answer to this algebra question

Help. help help help help

timofeeve [1]

Answer:

Step-by-step explanation:

not sure srorry for replying dont look at this

7 0

3 years ago

What is the solution of the following system of linear equations? −21 + 15x = 6y −5x + 2y = −8 Select one: A. (15, -7) B. (4, 11

quester [9]

Answer:

C. No solution

Step-by-step explanation:

System of Equations:

A) $-21+15x=6y$

B) $-5x+2y=-8$

Simplifying and rearranging equation A.

Dividing each term by 3 (common factor for each term) in equation A.

$\frac{-21}{3}+\frac{15x}{3}=\frac{6y}{2}$

$-7+5x=2y$

Subtracting both sides by $2y$

$-7+5x-2y=2y-2y$

$-7+5x-2y=0$

Adding 7 both sides.

$-7+7+5x-2y=0+7$

$5x-2y=7$

Adding the above equation to equation B.

$5x-2y=7$

+ $-5x+2y=-8$

We have $0=-1$

which is not true.

Hence the system has no solution. (Answer)

3 0

3 years ago

A train is traveling 300 feet per second. How fast is this in miles per hour?

FinnZ [79.3K]

Answer:

204.545 miles per hour

6 0

3 years ago

Read 2 more answers

Which kind of triangle is shown/

liq [111]

Answer:

i think it's an isosceles triangle

8 0

3 years ago

Read 2 more answers

A study by the Pew Research Center1 reports that in 2010, for the first time, more adults aged 18 to 29 got their news from the

sergejj [24]

Answer:

Null hypothesis: $p \leq 0.65$

Alternative hypothesis: $p > 0.65$

$z=\frac{0.66 -0.65}{\sqrt{\frac{0.65(1-0.65)}{1500}}}=0.812$

$p_v =2*P(z>0.812)=0.208$

So the p value obtained was a very high value and using the significance level assumed $\alpha=0.05$ we have $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the true proportion it's not significantly higher from 0.65.

We don't have enough evidence to conclude that the true % it's higher than 65%, since we fail to reject the null hypothesis on this case.

Step-by-step explanation:

1) Data given and notation

n=1500 represent the random sample taken

X represent the adults that said television was one of their main sources of news.

$\hat p=0.66$ estimated proportion of adults that said television was one of their main sources of news.

$p_o=0.65$ is the value that we want to test

$\alpha=0.05$ represent the significance level

Confidence=95% or 0.95

z would represent the statistic (variable of interest)

$p_v$ represent the p value (variable of interest)

2) Concepts and formulas to use

We need to conduct a hypothesis in order to test the claim that the proportion is higher than 0.65:

Null hypothesis: $p \leq 0.65$

Alternative hypothesis: $p > 0.65$

When we conduct a proportion test we need to use the z statistic, and the is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .

3) Calculate the statistic

Since we have all the info requires we can replace in formula (1) like this:

$z=\frac{0.66 -0.65}{\sqrt{\frac{0.65(1-0.65)}{1500}}}=0.812$

4) Statistical decision

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

The significance level assumed $\alpha=0.05$ . The next step would be calculate the p value for this test.

Since is a right tailed test the p value would be:

$p_v =P(z>0.812)=0.208$

So the p value obtained was a very high value and using the significance level assumed $\alpha=0.05$ we have $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the true proportion it's not significantly higher from 0.65.

Do we find evidence that more than 65% of all US adults use television as one of their main sources for news?

We don't have enough evidence to conclude that the true % it's higher than 65%, since we fail to reject the null hypothesis on this case.

6 0

3 years ago

-3x + 2y = 7 What is the answer to this algebra question