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Greeley [361]
3 years ago
11

What is the equation of the quadratic graph with a focus of (8, −8) and a directrix of y = −6?

Mathematics
1 answer:
vitfil [10]3 years ago
7 0
The answer to your question is the third one I think
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A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and test
frutty [35]

Answer:

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

Step-by-step explanation:

We are in posession of the sample's standard deviation, so we use the students t-distribution to solve this question.

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 = 16 - 1 = 15

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.68

The margin of error is:

M = T*s = 2.1315*3645.94 = 7771.3

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 60139.7 - 7771.3 = 52,368.4.

The upper end of the interval is the sample mean added to M. So it is 60139.7 + 7771.3 = 67,911.

The 95% confidence interval for mean tire life is between 52,368.4 kilometers and 67,911 kilometers.

3 0
3 years ago
Read 2 more answers
What is the domain of the function =<br> x+6-7?<br> x2-7<br> X2-6<br> x26<br> Ox27
Keith_Richards [23]

The domain of the function is 27 i am 100% sure

8 0
3 years ago
Factor completely x2 − 10x + 25.
earnstyle [38]
X^2-10x+25 = (x-5)^2 or (x-5)(x-5)
7 0
3 years ago
Read 2 more answers
9 4/5 - 2 3/10= write in simplest form
Solnce55 [7]
Can you post your middle school questions in the middle school area...

9 4/5 - 2 3/10 = X
9 8/10 - 2 3/10 = X
7 5/10 = X
7 1/2 is simplest form
7 0
3 years ago
Please help me !!! need help will mark brainly
Ronch [10]

Answer:

1. is 3 2/3

2. is 3 1/4

3. is 2 1/4

Hope this helped! :)

4 0
3 years ago
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