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Anuta_ua [19.1K]
2 years ago
13

F(x) = 4x^2 - 10.3 + 2 2 Find f(-7

Mathematics
1 answer:
Whitepunk [10]2 years ago
7 0

Step-by-step explanation:

please mark me as brainlest

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A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the
NikAS [45]

Answer:

0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375    

0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377    

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

Step-by-step explanation:

Data provided

\bar X=0.376 represent the sample mean for the chloride concentration

\mu population mean (variable of interest)

s=0.0012 represent the sample standard deviation

n=15 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

Since we need to find the critical value first we need to begin finding the degreed of freedom

df=n-1=15-1=14

The Confidence is 0.95 or 95%, the significance would be \alpha=0.05 and \alpha/2 =0.025, and the critical value for this case with a t distribution with 14 degrees of freedom is t_{\alpha/2}=2.145

And the confidence interval is:

0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375    

0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377    

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

7 0
3 years ago
The length of a room is 16.40 m, its width is 4.5 m, and its height is 3.26 m. what volume does the room enclose?
AVprozaik [17]
<span>According the information given we understand that the room is a regular rectangle, We know that volume = lenght * widht * height, so we start by calculate the room area as length by width, that is 16.4 * 4.5 = 73.8 square metres. Then with 3.26 metres of height, the total volum will 73.8 * 3.26 = 240.58 cubic metres.</span>
5 0
2 years ago
Add or subtract. –29 + 40
ollegr [7]

Answer: well, technically you add but.... the answer is 11. Since it's a negative, one way to find the answer is to subtract 40 from 29, which is 11.

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
What is the range of the function?<br> A. (-1,3,5)<br> B. (2,6,8,3,5)<br> C. {3}<br> D. (2,6,8)
Roman55 [17]

Answer:

I think the answer is D. (2,6,8) because if the ones on the right are y - coordinates in the Function then it should be correct. If not sorry

(Range is y - coordinate)

(Domain is x - coordinate)

7 0
3 years ago
A feasible region is bounded by the constraints:   20 20 4 5 0.25 y x y x y x            The objective function is P
aev [14]
I think it is C I am just guessing
3 0
3 years ago
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