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GREYUIT [131]
3 years ago
6

Muriel says she has written a system of two linear equations that has an infinite number of solutions. One of the equations of t

he system is 3y = 2x – 9. Which could be the other equation?
Mathematics
1 answer:
Assoli18 [71]3 years ago
3 0

Answer: B) y= 2/3x - 3

Step-by-step explanation:

On edge

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To Test the ability of auto mechanics to identify simple engine problems, an automobile with a single suchproblem was taken to 7
dedylja [7]

Answer:

z=\frac{0.583 -0.75}{\sqrt{\frac{0.75(1-0.75)}{72}}}=-3.273  

p_v =P(Z  

So the p value obtained was a very low value and using any significance level for example \alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of mechanics who worked on the carcorrectly identified the problem is significantly less than 0.75.  

Step-by-step explanation:

1) Data given and notation  

n=72 represent the random sample taken

X=42 represent the mechanics who worked on the carcorrectly identified the problem

\hat p=\frac{42}{72}=0.583 estimated proportion of mechanics who worked on the carcorrectly identified the problem

p_o=0.75 is the value that we want to test

\alpha represent the significance level

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 true proportion is less than 0.75:  

Null hypothesis:p\geq 0.75  

Alternative hypothesis:p < 0.75  

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{0.583 -0.75}{\sqrt{\frac{0.75(1-0.75)}{72}}}=-3.273  

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 next step would be calculate the p value for this test.  

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

p_v =P(Z  

So the p value obtained was a very low value and using any significance level for example \alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of mechanics who worked on the carcorrectly identified the problem is significantly less than 0.75.  

7 0
3 years ago
Amy and Roger both wash windows at a large downtown building. Amy can wash 25 windows in 4 hours. Roger can wash 32 windows in 6
mote1985 [20]
Amy can wash 75 cars in 12 hours, Roger can wash 64 cars in 12 hours.
so therefore 75+64 =139
together they can wash 139 cars in 12 hours
4 0
2 years ago
Read 2 more answers
Will mark Brainliest
allochka39001 [22]

Answer:

x=9

y=15

Step-by-step explanation:

it's a parallelogram, the sides parallel are equal

8 0
2 years ago
What is the value of X? Enter answer as a decimal...
lozanna [386]

Answer:

37.89051724=x

Step-by-step explanation:

We can use similar triangles and proportions to solve.  Put the same side of the small triangle over the large triangle.

MA         MB

------- = ----------

MN         MP

80.5 -35         x

------------- = ----------

70.5               96.6 -x

Simplifying

45.5             x

------------- = ----------

70.5               96.6 -x

Using cross products

45.5 (96.6-x) = 70.5x

Distribute

4395.3 - 45.5 x = 70.5x

Add 45.5x to each side

4395.3 - 45.5 x+45.5x = 70.5x+45.5x

4395.3 = 116x

Divide each side by 116

4395.3/116 = 116x/116

37.89051724=x

6 0
3 years ago
Shaundra quiere triplicar el volumen de una pirámide cuadrada. ¿Qué debería hacer ella?
yaroslaw [1]

Answer:

Creo que la respuesta es el triple de la altura de la pirámide.

Step-by-step explanation:

3 0
3 years ago
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