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saveliy_v [14]
3 years ago
14

Which of the following statements are true?

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
3 0

Answer: D (I think)

Step-by-step explanation:

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How can you express 5 1/3 + (-7 2/3) as the sum of its integer and fractional parts
Yuliya22 [10]

Answer:

-7/3

Step-by-step explanation:

-7 2/3=-23/3

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-----------------

16/3+(-23/3)

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2 years ago
Evaluate f(x) = sqrt(5x + 4) for x = 12
Nezavi [6.7K]

Answer is 8

Work Shown:

f(x) = sqrt(5*x + 4)

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3 years ago
In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determi
lana [24]

Answer:

Confidence interval:  (1760,1956)

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 81

Sample mean =

\bar{x} = 1858 \text{ kWh}

Population standard deviation =

\sigma = 450 \text{ kilowatt-hours}

Confidence Level = 95%

Significance level = 5% = 0.05

Confidence interval:

\bar{x} \pm z_{critical}\displaystyle\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.05} = \pm 1.96

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3 years ago
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4 0
2 years ago
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