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andrezito [222]
3 years ago
15

Which of the following equations has the same solutions as the equation 3x + 2y= -12

Mathematics
1 answer:
tatuchka [14]3 years ago
6 0

Answer:

x= -2/3y-4

Step-by-step explanation:

3x+2y=-12

3x+2y-2y= -2y-12

3x=-2y-12

3x/3= -2y/3-12/3

x= -2/3y-4

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Answer:

A)

Note that              

             

Lower Bound = X - z(alpha/2) * s / sqrt(n)              

Upper Bound = X + z(alpha/2) * s / sqrt(n)              

             

where              

alpha/2 = (1 - confidence level)/2 =    0.025          

X = sample mean =    1723.4          

z(alpha/2) = critical z for the confidence interval =    1.959963985          

s = sample standard deviation =    89.55083319          

n = sample size =    30          

             

Thus,              

             

Lower bound =    1691.355235          

Upper bound =    1755.444765          

             

Thus, the confidence interval is              

             

(   1691.355235   ,   1755.444765   ) [ANSWER]

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b)

We assumed taht the distirbution of these observations is approximately normally distributed.

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c)

Yes, because the values are not far away from each other.

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3 years ago
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Answer:

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Step-by-step explanation:

7r-5r+8=9r+8-r

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