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Delicious77 [7]
2 years ago
6

Which equations are true?A: -x = -x + x + 0B: -x = 0 + (-x)C: None Of The Above ​

Mathematics
1 answer:
Leto [7]2 years ago
3 0
Answer: B
Explanation: if you look at A and try to combine like terms, you will add the -x on the right side the the one on the left, cancelling out the x on the left. then you have 0=x+0, and unless x=0, it is not true.
With B, when you add x to the -x, you cancel it out, giving you 0=0, which is true. hope it helps!
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Answer:

Mean =\sum x P(x) = 36.86

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x          P(x) x \times P(x)       x^2 \times  P(x)

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39            0.1     3.9         152.1

40            0.02     0.8         32

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We are supposed to find mean and standard deviation

Mean =\sum x P(x) = 36.86

Standard deviation =\sum x^2P(X)=1360.9

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