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Naddik [55]
3 years ago
10

2x+22=4(x + 3). Can you help?

Mathematics
2 answers:
kozerog [31]3 years ago
8 0
2x+22=4(x+3)
2x+22=4x+12
2x+10=4x
10=2x
5=x

Hope this helps :)
enot [183]3 years ago
5 0
First, you will start with distributive property. on the right side you will distribute 4 into x and 3.

the equation will become:
2x + 22 = 4x + 12

then you have to get x on only one side of the equal sign. subtract 2x from 4x and the equation becomes:
22 = 2x + 12

subtract 12 from 22:
10 = 2x

divide 10 by 2:
5 = x
or
x = 5

(:
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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.

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\mu = 71.9, \sigma = 7.8

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This is the value of X when Z has a pvalue of 0.16. So X when Z = -0.995.

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X - 71.9 = -0.995*7.8

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10th percentile:

This is the value of X when Z has a pvalue of 0.1. So X when Z = -1.28.

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X = 62

Grades between 62 and 64 result in a D grade.

6 0
3 years ago
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