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Arisa [49]
2 years ago
7

Help me with this please and thank you!! :)

Mathematics
1 answer:
Ann [662]2 years ago
7 0

Answer:

Step-by-step explanation:

  • A \cap C denotes the set of elements in both A and C, which is \{20, 24, 28\}.
  • B^{C} denotes the complement of set B, which is the set of all elements that are in the universal set that are not in set B. In this case, this set is \{3, 4, 5, 6, 8, 11, 13, 16, 17, 19, 20, 22, 23, 24, 25, 26, 27, 28\}
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Which of the following equations is used to find the value of c (the distance to the foci) for an ellipse? 
Reika [66]

The equation of ellipse:

\dfrac{(x-h)^2}{a^2}+\dfrac{(y-k)^2}{b^2}=1

The formula of c (the distance to the foci)

c^2=a^2-b^2\qquad|\text{add}\ b^2\ \text{to the both sides}\\\\c^2+b^2=a^2

<h3>Answer: c² + b² = a²</h3>
4 0
3 years ago
Addy’s monthly water bills for last year are $27, $31, $30, $26, $25, $27, $37, $33, $32, $28, $26, $26. Express the formula for
Sav [38]

Answer:

Σ( xi ) / n ; $29

Step-by-step explanation:

Given the following data:

X= $27, $31, $30, $26, $25, $27, $37, $33, $32, $28, $26, $26

Number of observations (n) = 12

Mean formula (m) = ( Σ xi ) / n

Where i = each individual value in X

Mean water bill for the years is thus :

m = Σ [(27 + 31 + 30 + 26 + 25 + 27 + 37 + 33 + 32 + 28 + 26 + 26)] / 12

m = 348 / 12

m = 29

Hence, the mean water bill for the year is $29

7 0
3 years ago
The men took an average of 21.89 hours of personal time per year with a standard deviation of 3.29 hours. The Human Resources De
erma4kov [3.2K]

The t-test for the two means is appropriate in this situation because women and men are independent samples.

<h3>What are Independent Samples?</h3>

Independent samples are chosen randomly, ensuring that their results are independent of other observations' values.

The premise that samples are independent underlies many statistical analyses. Others are made to evaluate non-independent sample sets.

The samples of men and women are independent since their results are independent of other observations' values.

The Independent Samples t-Test analyzes the means of two separate groups to see if there is statistical support that the population means values are statistically substantially different.

Learn more about Independent Samples here:

brainly.com/question/14099859

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3 0
3 years ago
6.<br> What is the equation for the graphed piecewise function?
dmitriy555 [2]

Answer:

  D

Step-by-step explanation:

The open circle at the origin means the rightmost piece will have domain x > 0. That is only the case in choices C and D.

The middle piece has a negative slope. That is only the case in choice D.

The appropriate piecewise function is ...

  f(x)=\begin{cases}-2,&\text{for }x\le-3\\-x+4,&\text{for }-30\end{cases}

8 0
3 years ago
What is the value of the Constant
valentinak56 [21]
If you divide the distance by the gas used you are able to derive a common ratio, which will give you the constant.

24/1.5 = 16
40/2.5 = 16
96/0.6 = 16 

The constant is 16
4 0
3 years ago
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