What is the sum of the polynomials? 11x^2-5 + x-4

Mathematics

1 answer:

polet [3.4K]3 years ago

5 0

Answer:

11x^2 +x -9

Step-by-step explanation:

first calculate the difference

11x^2-5+x-4

11^2-9+x

then reorder the terms, so just switch the -9 and x

11^2+x-9

and your done

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A professor gives her 100 students an exam; scores are normally distributed. The section has an average exam score of 80 with a

frozen [14]

Answer:

6.18% of the class has an exam score of A- or higher.

Step-by-step explanation:

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In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

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

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 question, we have that:

$\mu = 80, \sigma = 6.5$