3 years ago

If 7x + 19 = -79, then - 2x = ___?

Mathematics

1 answer:

cluponka [151]3 years ago

8 0

Answer:

Answer is 39.5

Step-by-step explanation:

firstly 7x+19=-79 so we divide-2x from -79 will give positive 39.5

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If point E is located at 9 and point F is located at -8 what’s the distance between E and F

Julli [10]

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3 years ago

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mel-nik [20]

9514 1404 393

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y = 1/2x +7

Step-by-step explanation:

I like to start with the 2-point equation for a line.

y = (y2 -y1)/(x2 -x1)(x -x1) + y1

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3 years ago

When the parameters of a population are known, the likelihood of obtaining a certain mean value, ¯ x , from a small sample can b

spayn [35]

Answer: 0.9545

Step-by-step explanation:

Given : Population mean : $x'=400\ N$

Standard deviation : $\sigma=25\ N$

Sample size : n=25

Test statistic : $z=\dfrac{\overline{x}-x'}{\dfrac{\sigma}{\sqrt{n}}}$

For $\overline{x}= 390$ , we have

$z=\dfrac{390-400}{\dfrac{25}{\sqrt{25}}}=-2$

For $\overline{x}= 410$ , we have

$z=\dfrac{410-400}{\dfrac{25}{\sqrt{25}}}=2$

Now, by using the standard normal distribution table for z , we have

$\text{P-value=}P(-2$

Hence, probability that this sampling will have a mean value between 390 and 410 = 0.9545

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4 years ago