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Arte-miy333 [17]
3 years ago
14

Please help me remember how to solve this equation: (13+x)².

Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
7 0

Answer:

x²+26x+169

Step-by-step explanation:

Factor it out:

1)           (x+13) (x+13)


2) Distributive property:

        x²+13x+13x+169 or x²+26x+169


Hope this helps!! :D

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Raw scores on a certain standardized test one year were normally distributed, with a mean of 156 and a standard deviation of 23.
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Answer:

About 220 of the students scored less than 96

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean of 156 and a standard deviation of 23.

This means that \mu = 156, \sigma = 23

Proportion that scored less than 96:

p-value of Z when X = 96. So

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

Z = \frac{96 - 156}{23}

Z = -2.61

Z = -2.61 has a p-value of 0.00453.

About how many of the students scored less than 96?

0.00453 out of 48592.

0.00453*48592 = 220.1.

Rounding to the closest integer:

About 220 of the students scored less than 96

3 0
3 years ago
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