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bixtya [17]
3 years ago
14

Find the multiplicative inverse of -2 in mod 7​

Mathematics
1 answer:
Elis [28]3 years ago
6 0

Answer:

  1. So something mod 7 is -2
  2. Lets consider what mod does as a commands: If you have 7 and then mod it by 2 ie 7%2 you get 1
  3. Essentially mod is seeing how many times a # goes into the other number and finding the remainder.
  4. In this case we want the remainder of 2: -8%3 =-2
  5. note there is also a mathematical procedural way to solve this.
  6. Rate positively and give brainlist
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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.

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3 years ago
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liubo4ka [24]
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29.046 rounded to nearest whole number
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57/100 whats the part whats the whole
Ostrovityanka [42]
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A brand of cereal had 1.2 mg of iron per serving then they change their receipt so they had 1.8 mg of iron per serving what was
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Answer:

50\%

Step-by-step explanation:

To Calculate the percentage Increase

<u>Step 1</u>: Subtract the old value from the new value

1.8 mg - 1.2 mg = 0.6 mg

<u>Step 2:</u> Divide the difference by the Old Value

\dfrac{0.6}{1.2}

<u>Step 3: </u>Multiply by 100

\dfrac{0.6}{1.2} X 100\\=50\%

The Percentage Increase in Iron is 50%.

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3 years ago
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