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slava [35]
2 years ago
10

What is 83 times 13?

Mathematics
2 answers:
Alexxx [7]2 years ago
8 0

Answer:

1079

Step-by-step explanation:

sesenic [268]2 years ago
6 0

Answer:

hiiiii!! how are youu todayy ?

Step-by-step explanation:

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lesya692 [45]
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In monitoring lead in the air after the explosion at the battery factory, it is found that the amounts of lead over a 7 day peri
Andrew [12]

Answer:

MOE=\pm \ 1.41

Step-by-step explanation:

-Given that \sigma=1.91, n=7

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z_{\alpha/2}=z_{0.025}=1.96

-The margin of error is the degree of error from the real value and is calculated as follows:

MOE=\pm z_{\alpha/2} (\frac{\sigma}{\sqrt{n}})\\\\=\pm z_{0.025}\times\frac{\sigma}{\sqrt{n}}\\\\=\pm 1.96\times \frac{1.91}{\sqrt{7}}\\\\=\pm 1.41

Hence, the margin of error is \pm 1.41

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3 years ago
Pure acid is to be added to a 10​% acid solution to obtain 21 L of a 40​% acid solution.
Mazyrski [523]

7 gallons of pure acid and 14 gallons of 10% acid

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