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Iteru [2.4K]
4 years ago
10

Which system of equations is represented by the graph?

Mathematics
1 answer:
erica [24]4 years ago
4 0

Answer:

               y=x\\\\y=\dfrac{-x+10}{x-4}

Step-by-step explanation:

Red line is increasing and for any x goes the same y, so it's y = x

The blue graph is  y=\dfrac a{x-h}+k, where h=4 and k =-1 and for x=5 also y=5

It gives:

               5=\dfrac a{5-4}+(-1)\\5=a-1\\a=6

So:

      y=\dfrac6{x-4}-1 =\dfrac6{x-4}-\dfrac{x-4}{x-4} =\dfrac{6-x+4}{x-4}=\dfrac{-x+10}{x-4}

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3 years ago
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Answer:

4600-1.646\frac{800}{\sqrt{1800}}=4568.96    

4600+1.646\frac{800}{\sqrt{1800}}=4631.04    

We are confident at 90% that the true mean for the amount spent on medicines is between (4568.96 and 4631.04)

Step-by-step explanation:

Information given

\bar X=4600 represent the sample mean for the amount spent on medicines

\mu population mean

s=800 represent the sample standard deviation

n=1800 represent the sample size  

Solution

The confidence interval for the true population mean is given by:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

We can calculate the degrees of freedom with:

df=n-1=1800-1=1799

We know that the Confidence level is 0.90 or 90%, the value of significance is \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,1799)".And we see that t_{\alpha/2}=1.646

Replcing in the formula for the confidence interval we got:

4600-1.646\frac{800}{\sqrt{1800}}=4568.96    

4600+1.646\frac{800}{\sqrt{1800}}=4631.04    

We are confident at 90% that the true mean for the amount spent on medicines is between (4568.96 and 4631.04)

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Answer:

Step-by-step explanation:

7/3+12-2=12.33

7/2+12-3=12.5

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