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NARA [144]
3 years ago
10

What’s equivalent to (18x + 9k) +(2x + 6k)

Mathematics
2 answers:
artcher [175]3 years ago
6 0
18x + 9k + 2x + 6k.....combine like terms
20x + 15k or 5(4x + 3k)

gladu [14]3 years ago
4 0

Combine like terms.

18x + 2x = 20x

9k + 6k = 15k

20x + 15k is your answer

Note that you cannot combine 15k and 20x, because they have different variables

hope this helps

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2 years ago
A humanities professor assigns letter grades on a test according to the following scheme. A: Top 12% of scores B: Scores below t
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Answer:

The minimum score required for an A grade is 88.

Step-by-step explanation:

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

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 problem, we have that:

\mu = 77.8, \sigma = 8.5

Find the minimum score required for an A grade.

Top 12%, which is at least the 100-12 = 88th percentile, which is the value of X when Z has a pvalue of 0.88. So it is X when Z = 1.175.

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

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X = 87.8

Rounding to the nearest whole number

The minimum score required for an A grade is 88.

5 0
3 years ago
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Step-by-step explanation:

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3 years ago
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The interior angles of a triangle have measures k°, 27°, and 10°. What is the value of k? Enter your answer in the box.
Triss [41]
To find the measure of the third angle you should keep in mind the following:
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 the value of k is 143 °
3 0
3 years ago
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