How do I work out this equation 7x+5=8x-25

2 answers:

8 0

Subtract 7x from 8x then add 25 to 5 then divide what you get when you subtract 7 from 8 by what you get when you add 25 to 5 and that's your answer ( add x to the answer).

beks73 [17]3 years ago

4 0

7x + 5 = 8x - 25
- 5 = -8x -5
-------------------------------
7x - 8x = - 5 - 25

-1x = - 30
----- -------
-1 -1

x = 30

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And we can find this probability with this difference:

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

$X \sim N(3500,250)$