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Zolol [24]
3 years ago
8

Which expression is the additive inverse of n? A. 1/n B. -n C. -1/n D. -(-n)

Mathematics
2 answers:
Lady_Fox [76]3 years ago
8 0

Answer:

b

Step-by-step explanation:

Marrrta [24]3 years ago
6 0
The additive inverse of something is whats added to the original to get 0

So in this case n - n = 0, which is B :)
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2 years ago
Among freshman at a certain university, scores on the Math SAT followed the normal curve, with an average of 550 and an SD of 10
lina2011 [118]

Answer:

a) 6.68th percentile

b) 617.5 points

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

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Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 550, \sigma = 100

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Z = \frac{X - \mu}{\sigma}

Z = \frac{400 - 550}{100}

Z = -1.5

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X - 550 = 0.675*100

X = 617.5

6 0
3 years ago
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