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Hunter-Best [27]
3 years ago
8

Twice a number is equal to 35 more than 7 times the number. Find the number.

Mathematics
2 answers:
masya89 [10]3 years ago
7 0

Answer:

-7

Step-by-step explanation:

make an equation-

2x=35+7x

-5x=35

x=-7

nikklg [1K]3 years ago
7 0

Answer:

-7

Step-by-step explanation:

number - n

Twice a number - 2n

Seven times the number - 7n

2n = 7n +35

7n-2n = -35

5n = -35

n = - 7

Check:

2(-7) = 7(-7) +35

-14 = -49 + 35

-14 = -14 True

The number is (- 7).

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Answer:

3x+5 ????

Step-by-step explanation:

4 0
2 years ago
The weight of a package of mints is believed to be normally distributed with mean 21.37 grams and standard deviation 0.4, i.e. X
nasty-shy [4]

Answer:

P(21

And using a calculator, excel or the normal standard table we have that:

P(-1.85

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 weigths of a population, and for this case we know the distribution for X is given by:

X \sim N(21.37,0.4)  

Where \mu=21.37 and \sigma=0.4

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 can find the probability required with the following z score formula:

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


And replacing we got:

P(21

And using a calculator, excel or the normal standard table we have that:

P(-1.85

6 0
3 years ago
Professor Blanchard is packing up the books in he office to move to a new location. A small box can hold 44 books and a large bo
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Answer:

x=10

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Step-by-step explanation:

6 0
2 years ago
You have c cookies. Brooke has twice as many cookies as you do. Which expression correctly shows how many cookies Brooke has?
adelina 88 [10]

Answer:

I would put A

Step-by-step explanation:

Because B C D all say plus and that is wrong

<em>it this was helpful can I please have brainliest</em>

3 0
2 years ago
Read 2 more answers
Henskissmehduiwkwnwnwjwidnbd
user100 [1]

Answer:

what?

Step-by-step explanation:

STOP WITH THESE

3 0
2 years ago
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