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3 years ago

8x - 2 = -9 + 7x what does x equal

Mathematics

2 answers:

ikadub [295]3 years ago

7 0

Answer:x=-7

Step-by-step explanation:

Regroup terms.

8x-2=7x-98x−2=7x−9

2 Subtract 7x7x from both sides.

8x-2-7x=-98x−2−7x=−9

3 Simplify 8x-2-7x8x−2−7x to x-2x−2.

x-2=-9x−2=−9

4 Add 22 to both sides.

x=-9+2x=−9+2

5 Simplify -9+2−9+2 to -7−7.

x=-7x=−7

Nimfa-mama [501]3 years ago

4 0

Answer:

x = - 7

Step-by-step explanation:

8x - 2 = -9 + 7x (add 2 to both sides)

8x - 2 + 2 = -9 + 7x + 2

8x = 7x - 7 (subtract 7x from both sides)

8x - 7x = 7x - 7 - 7x

x = - 7

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Soloha48 [4]

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And replacing we got:

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Step-by-step explanation:

From the info given if we define the random variable X as "amount of saturated fat in a daily serving of a particular brand of breakfast cereal " we know that the distribution of X is given by:

$X \sim N(\mu =25, \sigma =4)$

Part a

For this case the sample size would be n =30 and then the distribution for the sample mean would be given by:

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

And replacing we got:

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Part b

We want to find this probability:

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And we can use the z score formula given by:

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And replacing we got:

$z =\frac{27-25}{\frac{4}{\sqrt{30}}}= 2.739$

And using the normal standard distribution table and the complement rule we got:

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