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Temka [501]
3 years ago
7

Solve. 1/2(-4 — 2n) = -17 Please explain it to me if you can I dont really understand how to do these types of problems so it wo

uld be much appreciated!
Mathematics
2 answers:
Aliun [14]3 years ago
6 0
The correct answer would be n = 15.
ad-work [718]3 years ago
4 0

Answer:

<h2>n = 15</h2>

Step-by-step explanation:

\frac{1}{2} ( - 4 - 2n) =  - 17

First of all try to see if there are fractions in the equation .

If so try to find the LCM of the fractions and multiply the equation through by the LCM.

If there is only one fraction multiply through by the denominator of the fraction to eliminate the fraction

If there are brackets try to solve the terms in the bracket first

For the above equation there is only one fraction which is 1/2 so we multiply through by the denominator that's 2

That's

2 \times  \frac{1}{2} ( - 4 - 2n) =  - 17 \times 2

- 4 - 2n =  - 34

Try to make the unknown variable the subject

That's

- 2n =  - 34  + 4

Simplify

- 2n =  - 30

Divide both sides by -2 to make n stand alone

That's

\frac{ - 2n}{ - 2}  =  \frac{ - 30}{ - 2}

We have the final answer as

<h3>n = 15</h3>

Hope this helps you

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Step-by-step explanation:

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The mean annual inflation rate in the United States over the past 98 years is 3.37% and has a standard deviation of approximatel
Ksenya-84 [330]

Answer:

38.59% probability that inflation rate will be below 1.9% in 2019

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 3.37, \sigma = 5

If the annual inflation rate is normally distributed, what is the probability that inflation rate will be below 1.9% in 2019?

This is the pvalue of Z when X = 1.9. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{1.9 - 3.37}{5}

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Z = -0.29 has a pvalue of 0.3859

38.59% probability that inflation rate will be below 1.9% in 2019

4 0
3 years ago
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