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Andru [333]
2 years ago
12

12.5,−10,−7.5,x; The mean is 11.5.

Mathematics
1 answer:
Stella [2.4K]2 years ago
5 0

Answer:

x = 51

Step-by-step explanation:

the mean is calculated as

mean = \frac{sum}{count}

here mean = 11.5 , then

\frac{12.5-10-7.5 +x}{4} = 11.5 ( multiply both sides by 4 to clear the fraction )

- 5 + x = 46 ( add 5 to both sides )

x = 51

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Answer:

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Step-by-step explanation:

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|u|>14 means that the number u has to be greater than 14 or less than -14.  These numbers I describe just now all have a distance greater than 14 from 0.

So |u|>14 implies u>14 or u<-14.

But we are solving |2x+4|>14 so this implies we have 2x+4>14 or 2x+4<-14.

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Divide both sides by 2:

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So our solution is x>5 or x<-9.

Graphing!

~~~~~~~O                                         O~~~~~~~~

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We shaded to the left of -9 because our inequality says x is less than -9.

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