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3 years ago

Simplify -2x+7=15, i need help understanding why it is -4

Mathematics

1 answer:

yulyashka [42]3 years ago

3 0

Answer:

-4

Step-by-step explanation:

Step 1: Subtract 7 from both sides.

−2x+7−7=15−7

−2x=8

Step 2: Divide both sides by -2.

−2x

−2

x=−4

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ICE Princess25 [194]

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A survey found that the American family generates an average of 17.2 pounds of glass garbage trash each year. Assume the standar

SIZIF [17.4K]

Answer: 0.8137

Step-by-step explanation:

As per given , we have

$\mu= 17.2\ ,\ \sigma=2.5$

Sample size : n= 47

Let $\overline{X}$ be the sample mean o.

Then, the probability that the mean of a sample of 47 families will be between 16.6 and 17.6 pounds will be :

$P(16.6$

$=P(-1.645$

[∵ $z= \dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}$ ]

$=P(z$

$=0.8636793-(1- 0.9500151)$ [By using p-value calculator]

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Hence, the probability that the mean of a sample of 47 families will be between 16.6 and 17.6 pounds= 0.8137

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4 years ago

0.8(m-5) = 10<br> please show every step

xxTIMURxx [149]

First multiply 0.8 times m, then multiply 0.8 times -5.

This will give you 0.8m-4 = 10
Then add four to both sides to get you 0.8m =14.
Divide both sides by 0.8 to get m=17.5

Hope this helped. Good luck! :)

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Lisa [10]

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Step-by-step explanation:

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Read 2 more answers

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Tems11 [23]

Might be wrong but y=2-2x

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