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Naddika [18.5K]
3 years ago
8

9(3n-9)-7-2n What is the answer to this I really need help.

Mathematics
2 answers:
m_a_m_a [10]3 years ago
7 0

Answer:

25n - 88

Step-by-step explanation:

distribute to get to =27n+−81+−7+−2n

combine like terms to get =25n+−88

you cannot simplify any further, making the answer 25n-88

Molodets [167]3 years ago
7 0

Answer:

25n-88

Step-by-step explanation:

Question: 9(3n-9)-7-2n

1) Distribute 9 to 3n and -9:

27n-81-7-2n

2) Combine alike terms:

25n-88

Footnotes:

- The Distributive property says a(b+c)=ab+ac

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A researcher selects all of the possible samples with n = 8 scores from a population and computes the mean, dividing by n, for e
Nadusha1986 [10]

Answer:

By the Central Limit Theorem, the average value for all of the sample means is 14.

Step-by-step explanation:

We use the central limit theorem to solve this question.

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, the sample means of size n can be approximated to a normal distribution with mean \mu and standard deviation, which is also called standard error s = \frac{\sigma}{\sqrt{n}}

If the population mean is μ = 14, then what is the average value for all of the sample means?

By the Central Limit Theorem, the average value for all of the sample means is 14.

3 0
3 years ago
A refrigerator costs $580 a year to run. A family purchases a new one for $1200 that will save them 22% annually in energy costs
NeTakaya

Answer:

It will take nine years and four months for the refrigerator to pay for itself.

Step-by-step explanation:

The new refrigerator which costs $1200, saves the family 22% annually in energy cost.

Since the old refrigerator costs $580 to run, we want to determine how many years it will take for 22% of $580 per year to make $1200.

22% of $580

= 580 × 0.22

= 127.6

That is, it saved then $127.6 per year.

Now,

$1200/127.6

≈ 9.4

Which means, it will take 9 years and 4 months for the refrigerator to pay for itself.

7 0
2 years ago
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Answer:

under the seaquance

Step-by-step explanation:

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2 years ago
Find the sum of this infinite geometric series where a1=0.3 and r=0.55
Lisa [10]
Hello, Marymack!


We know that in a geometric sequence defined by \mathsf{a_1} and \mathsf{r} , the sum can be calculated the following way:

\mathsf{S_n = \dfrac{a_1}{1-r}}\\ \\ \\ \\ \mathsf{S_n = \dfrac{0.3}{1-0.55}}\\ \\ \\ \mathsf{S_n = \dfrac{0.3}{0.45}}\\ \\ \\ \boxed{\mathsf{S_n = \dfrac{2}{3}=0.666...}}
3 0
3 years ago
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Flura [38]
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3 years ago
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