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Arlecino [84]
3 years ago
15

in a certain chemical the ratio of zinc to Cooper is 4 to 19 A jar of the chemical contains 760 grams of cooper how many grams o

f zinc does it contain ?
Mathematics
1 answer:
WARRIOR [948]3 years ago
6 0
It contains 160 grams of Zinc. Given that, the ratio of Cooper is 19 to Copper grams of 760 grams. Divide 760 grams by 19 equals 40. Then just multiple 40 by the ratio of Zinc given of 4. Leading to an answer of 160 grams of Zinc.
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(2+2w)⋅4+9(w+3) please answer this I am very confused
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Answer:

17w+35

Step-by-step explanation:

(2+2w)⋅4+9(w+3)

Distribute the 4  and the 9

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Combine like terms

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Answer:

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Step-by-step explanation:

Using the Empirical rule

1) 68% of data falls within 1 standard deviation from the mean - that means between μ - σ and μ + σ .

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3)99.7% of data falls within 3 standard deviations from the mean - between μ - 3σ and μ + 3σ .

From the above question,

Mean = 349 , standard deviation = 24.

Confidence interval = 95%

Using 2)95% of data falls within 2 standard deviations from the mean - between μ – 2σ and μ + 2σ .

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μ + 2σ

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= 397

Therefore, according to the standard deviation rule, approximately 95% of the students spent between $301 and $397 on textbooks in a semester.

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Step-by-step explanation:

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