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trapecia [35]
3 years ago
6

Please help im lost.

Mathematics
1 answer:
8_murik_8 [283]3 years ago
8 0

Answer:

2

Step-by-step explanation:

h(t) =  - 16 {t}^{2}  + 64 \\ \Leftrightarrow 0 =  - 16 {t}^{2}  + 64 \\ \Leftrightarrow  {t}^{2}  = 4\Leftrightarrow t =  \pm2\Leftrightarrow t = 2 \: (t  \geqslant 0)

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A punch recipe requires 2 cups of cranberry juice to make 3 gallons of punch. using the same recipe, what is the total amount of
mario62 [17]

Answer is D) 2/3 because you divide the whole equation by 3 scene as 2cups=3gal. In order to get one gal, you need to divide the right side by 3 to make one and what you do to one side of an equation, you must do to the other.

6 0
3 years ago
An experiment to investigate the survival time in hours of an electronic component consists of placing the parts in a test cell
mixer [17]

Answer:

a) The sample mean is of 49 and the sample standard deviation is of 11.7.

b) The range of the true mean at 90% confidence level is of 9.62 hours.

c) The prediction interval, at a 90% confidence level, of it's failure time is between 39.38 hours and 58.62 hours.

Step-by-step explanation:

Question a:

Sample mean:

\overline{x} = \frac{34+40+46+49+61+64}{6} = 49

Sample standard deviation:

s = sqrt{\frac{(34-49)^2+(40-49)^2+(46-49)^2+(49-49)^2+(61-49)^2+(64-49)^2}{5}} = 11.7

The sample mean is of 49 and the sample standard deviation is of 11.7.

b)Determine the range of the true mean at 90% confidence level.

We have to find the margin of error of the confidence interval. Since we have the standard deviation for the sample, the t-distribution is used.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 6 - 1 = 5

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 5 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 2.0.150

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample. So

M = 2.0150\frac{11.7}{\sqrt{6}} = 9.62

The range of the true mean at 90% confidence level is of 9.62 hours.

(c)If a seventh sample is tested, what is the prediction interval (90% confidence level) of its failure time.

This is the confidence interval, so:

The lower end of the interval is the sample mean subtracted by M. So it is 49 - 9.62 = 39.38 hours.

The upper end of the interval is the sample mean added to M. So it is 49 + 9.62 = 58.62 hours.

The prediction interval, at a 90% confidence level, of it's failure time is between 39.38 hours and 58.62 hours.

4 0
3 years ago
Look at the shaded shapes drawn on a square grid. The area of the rectangle A is double the area of square b is he correct?
Kaylis [27]
No it’s not double the area
7 0
3 years ago
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Tonisha is purchasing a number of stamps. She wants some idea of how many she can buy.
Ulleksa [173]

Answer:

9 stamp

Step-by-step explanation:

3 0
3 years ago
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How do you factor n^3-2n^2 ?
antoniya [11.8K]
Factor out common numbers or variables when you can.

To make this the most simplified factor, factor out n², as it is the least factor both have.

n³/n² = n
-2n²/n² = -2

n - 2 is your new answer


hope this helps
7 0
3 years ago
Read 2 more answers
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