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Mathematics

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jeyben [28]3 years ago

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Can uu tell me what country this is????/ cuz i accidentally found this site when me doing hw

ANEK [815]3 years ago

6 0

Answer:

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What is the coefficient of x2 in the expansion of(x+2)3

Pachacha [2.7K]

First expand:

$(x+2)(x+2)(x+2)$

$(x^2+4x+4)(x+2)$

$(x^3+2x^2+4x^2+8x+4x+8)$

Now combine like terms:

$x^3+6x^2+12x+8$

A coefficient is a number that is in front of an x. The number in front of the x squared term is 6.

So the answer is 6.

3 0

3 years ago

Read 2 more answers

The time it takes a customer service complaint to be settled at a small department store is normally distributed with a mean of

noname [10]

Answer:

0.0475 = 4.75% probability that a randomly selected complaint takes more than 15 minutes to be settled.

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 10 minutes and a standard deviation of 3 minutes

This means that $\mu = 10, \sigma = 3$