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Vlada [557]
3 years ago
15

Need help please very confuzzled

Mathematics
2 answers:
Korvikt [17]3 years ago
8 0
Ok, let’s take a look at this from a different perspective, without looking at x or y.

We know that the lower left angle, not looking at the intersecting line, is a 90 degree angle. The 40 degrees indicates that the remaining side is 50 degrees. Let’s call this angle A.


Now, still ignoring x and y, take a look at the top line and the bottom line. Notice that they are parallel, indicated by the red arrows. This means that the 90 degree angle you see at the lower left corner also applies to the upper left.

Finally, plugging in the 3y we see at the top, angle b is 3y=90.


We know that all triangles add up to 180 degrees. So, let’s set up that equation.

180=50+90+5x
180=140+5x
40=5x
x=8


That said; the answer to this is x=8, and y=30 (Sorry this took a while! I made a mistake halfway through.)

SVEN [57.7K]3 years ago
7 0
I'm not too sure either.

5(5) + 3(5) = 40 and

5(2) + 3 (10) = 40

If you can't think of anything maybe that'll help
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In a survey of adults aged 57 through 85​ years, it was found that 86.6​% of them used at least one prescription medication. Com
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b) The 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is (85.6%, 87.6%).

Step-by-step explanation:

Question a:

86.6% out of 3149, so:

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Question b:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

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For this problem, we have that:

n = 3149, \pi = 0.866

90% confidence level

So \alpha = 0.1, z is the value of Z that has a p-value of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.  

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.866 - 1.645\sqrt{\frac{0.866*0.134}{3149}} = 0.856

The upper limit of this interval is:

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0.856*100% = 85.6%

0.876*100% = 87.6%.

The 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is (85.6%, 87.6%).

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