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DIA [1.3K]
3 years ago
8

Tim and Mary are building a special brick wall in the town playground. There will be 212 bricks in the bottom layer, 204 bricks

in the second layer, 196 bricks in the third layer, and so on in the same pattern. The wall will be 20 layers high. They want to know how many bricks will be in the top layer.
Drag and drop a response into the first box that represents the explicit expression that can be used to find out how many bricks will be in the top layer.
Drag and drop the number of bricks that will be in the top layer into the second box.
Mathematics
1 answer:
Serhud [2]3 years ago
4 0

Answer:

e

Step-by-step explanation:

e

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-8k + 6 = -10k + 10 SOMEONE HELP QUICKKKK
Amiraneli [1.4K]

Answer:

k = 2

Step-by-step explanation:

-8k + 6 = -10k + 10

-8k = -10k +4

2k = +4

2k / 2 = 4 / 2

k = 2

3 0
3 years ago
Read 2 more answers
Solve the formula <br> x − y = −8 for y.
laiz [17]

Answer:

y = x + 8

Step-by-step explanation:

x - y =  - 8

x + 8 = y

4 0
3 years ago
At a family reunion, each of Eddie's aunts and uncles is getting photographed once. The
sveticcg [70]

Answer:

Step-by-step explanation:

It will just be 12, since the uncles can go in one group and fit 12 uncles, and than the aunts can get photographed in 2 groups that add up to 12

4 0
3 years ago
The original price of a mirror was priced at $15 but was on sale. The amount of the discount is $3. What percent is the discount
Sloan [31]

Answer:

20%

Step-by-step explanation:

You do 3 divided by 15 which is 0.2, or 20 percent.

5 0
2 years ago
A small town has 2000 families. The average number of children per family is mu = 2.5, with a standard deviation sigma = 1.7. A
Nikitich [7]

Answer:

Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

Where \mu=2.5 and \sigma=1.7

We select a sample of n =64 >30 and we can apply the central limit theorem. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And for this case the standard error would be:

\sigma_{\bar X} = \frac{1.7}{\sqrt{64}}= 0.2125

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Solution to the problem

Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

Where \mu=2.5 and \sigma=1.7

We select a sample of n =64 >30 and we can apply the central limit theorem. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And for this case the standard error would be:

\sigma_{\bar X} = \frac{1.7}{\sqrt{64}}= 0.2125

6 0
3 years ago
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