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3 years ago

7(x-7)+9 (4+4x) Please help

Mathematics

2 answers:

andrew11 [14]3 years ago

8 0

Answer: 11x-36

Step-by-step explanation:

geniusboy [140]3 years ago

6 0

7(X - 7) + 9 (4 + 4x) ****For this problem, we will be using distributive property and combining like terms.
= 7x - 49 + 36 + 36x
= 7x + 36x - 49 + 36
= 43x - 13

So, in conclusion, the answer to this problem is: 43x - 13.

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Ahat [919]

The median of a set of numbers is the midpoint of the set if you were to organize the numbers from least to greatest or greatest to least. So, all we have to do is rearrange the numbers from least to greatest and find the midpoint:
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count 3 in from both sides and the remaining number is 82, which is the median.

8 0

3 years ago

The heights of baby giraffe are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If 100 b

ANEK [815]

Answer:

$P(\bar X$

And we can solve this using the following z score formula:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And if we use this formula we got:

$z = \frac{63-63.6}{\frac{2.5}{\sqrt{100}}}= -2.4$

So we can find this probability equivalently like this:

$P( Z$

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".

Solution to the problem

Let X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

$X \sim N(63.6,2.5)$

Where $\mu=63.6$ and $\sigma=2.5$

We select n =100. Since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

We want this probability:

$P(\bar X$

And we can solve this using the following z score formula:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And if we use this formula we got:

$z = \frac{63-63.6}{\frac{2.5}{\sqrt{100}}}= -2.4$

So we can find this probability equivalently like this:

$P( Z$

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3 years ago

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Salsk061 [2.6K]

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4 years ago

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harkovskaia [24]

Answer:

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Step-by-step explanation:

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2 years ago

Read 2 more answers

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nignag [31]

Answer:

123

Step-by-step explanation:

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4 0

3 years ago