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Genrish500 [490]
3 years ago
9

Solve number 4 please

Mathematics
1 answer:
lawyer [7]3 years ago
6 0

Answer:

3

Step-by-step explanation:

Slope is given by

\frac{y2 - y1}{x2 - x1}

where y2 = -1, y1 = -7, x2 = -1, x2 = -3

\frac{ - 1 - ( - 7)}{ - 1 - ( - 3)}  =  \frac{ - 1 + 7}{ - 1 + 3}

=   \frac{6}{2}  = 3

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When is the mean most useful in describing a set of data?
Anettt [7]

Answer:

When the range is wide

Step-by-step explanation:

8 0
3 years ago
35. In a simple random sample of 25 high school students, the sample mean of the SAT scores was 1450, and the sample variance wa
Tatiana [17]

Answer:

1450-2.0\frac{30}{\sqrt{25}}=1450-12    

1450+2.0\frac{30}{\sqrt{25}}=1450+12    

And the best option would be:

c. 1450 +/- 12

Step-by-step explanation:

Information provided

\bar X=1450 represent the sample mean for the SAT scores

\mu population mean (variable of interest)

s^2 = 900 represent the sample variance given

n=25 represent the sample size  

Solution

The confidence interval for the true mean is given by :

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The sample deviation would be s=\sqrt{900}= 30

The degrees of freedom are given by:

df=n-1=2-25=24

The Confidence is 0.954 or 95.4%, the value of \alpha=0.046 and \alpha/2 =0.023, assuming that we can use the normal distribution in order to find the quantile the critical value would be z_{\alpha/2} \approx 2.0

The confidence interval would be

1450-2.0\frac{30}{\sqrt{25}}=1450-12    

1450+2.0\frac{30}{\sqrt{25}}=1450+12    

And the best option would be:

c. 1450 +/- 12

3 0
3 years ago
Please I need help with this question: 2 + 2d > 6
Aleonysh [2.5K]

d > 2

Step-by-step explanation:

1) Subtract 2 from both sides.

2d > 6 - 2

2) Simplify 6 - 2 to 4.

2d > 4

3) Divide both sides by 2.

d >  \frac{4}{2}

4) Simplify 4/2 to 2.

d  > 2

Therefor, the answer is, d >2.

3 0
3 years ago
Read 2 more answers
Bob sees a very tall white pine tree. He estimates that the angle of elevation from him to the top of the tree is 77°
vlabodo [156]

Answer:

  86.63 ft

Step-by-step explanation:

The tangent relation applies.

  Tan = Opposite/Adjacent

  tan(77°) = (tree height)/(20 ft)

  tree height = (20 ft)·tan(77°) ≈ 86.63 ft

_____

<em>Additional comment</em>

It is somewhat problematic for Bob to see the top of a white pine tree at that angle of elevation. His view would likely be obscured by the branches of the tree.

8 0
2 years ago
According to the fundamental theorem of algebra how many roots exist for the polynomial function f(x)=8x^7-x^5+x^3+6
mojhsa [17]

Answer:

7

Step-by-step explanation:

This is a 7th degree polynomial.  There should be 7 roots.  Note how degree of poly = number of roots.

5 0
3 years ago
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