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Lorico [155]
3 years ago
12

Hello can anyone please help me

Mathematics
1 answer:
____ [38]3 years ago
6 0

Answer:

B.

Step-by-step explanation:

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Is the inequality true or false?<br><br> 8 + 5(2 x 4) ≥ 9 x 5
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Answer:

  true

Step-by-step explanation:

Using the order of operations to evaluate the expressions, we have ...

  8 + 5(8) ≥ 9(5)

  8 +40 ≥ 45

  48 ≥ 45 . . . . . true

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Im sorry i dont understand the question.. Is there another form of the question you can give me?

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3 years ago
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.

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3 years ago
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Which definition best describes vertical angles?
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B is the answer

Step-by-step explanation:

Vertical angles are pair angles formed when two lines intersect. Vertical angles are sometimes referred to as vertically opposite angles because the angles are opposite to each other

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