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LiRa [457]
3 years ago
14

Please help , would be greatly appreciated !

Mathematics
1 answer:
hoa [83]3 years ago
5 0

Answer:

<em>x </em>= 2

<em>y </em>= -1

Step-by-step explanation:

<em>8x </em>+ <em>2y </em>= 14

<em>2x </em>+ <em>y </em>= 3

In order to find the number <em>x</em> represents, you have to make the number of <em>y </em>for both equations the same. So:

<em>8x </em>+ <em>2y</em><em> </em>= 14

(×2) <em>4x </em>+ <em>2y</em><em> </em>= 6 (×2)

Then, you can cancel the <em>y </em>off both equations, which will leave:

<em>8x </em>= 14

<em>4x </em>= 6

To find <em>4x</em>, you have to find the difference between both equations, so you have to:

14 - 6 = 8

Now that the actual number <em>4x </em>represents is 8, so:

<em>4x </em>= 8

(÷4) <em>x </em>= 2 (÷4)

Now to find <em>y</em>, substitute the letter <em>x</em> with 2:

<em>2x </em>+ <em>y </em>= 3

<em>2 </em>(2)<em> </em>+ <em>y </em>= 3

<em>4 </em>+ <em>y </em>= 3

<em>4 - 3 </em>= -<em>y </em>

<em>1 </em>= -<em>y</em>

(× -) <em>-1 </em>= <em>y </em>(× -)

Answer: <em>x </em>= 2

<em>               y </em>= -1

Hope this helps!  :)

(NOTE: Do you mind marking me as Brainliest?)

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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Assuming that the deviation is known we can express the margin of error is given by this formula:

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n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

Replacing into formula (b) we got:

n=(\frac{1.64(14.7)}{3})^2 =64.57 \approx 65

So the answer for this case would be n=65 rounded up to the nearest integer

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