Simplify the expressions. Show your work. 3x(4x^4-5x)

1 answer:

8 0

The first step to simplifying this expression is to multiply each te in the parenthesis by 3x.
3x × 4 $x^{4}$ - 3x × 5x
Now calculate the first product in this expression.
12 $x^{5}$ - 3x × 5x
Calculate the second product in this expression.
12 $x^{5}$ - 15 $x^{2}$
Since you cannot simplify this expression any further,, the correct answer to your question is 12 $x^{5}$ - 15 $x^{2}$ .
Let me know if you have any further questions
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In a recent contest, the mean score was 210 and the standard deviation was 25. a) Find the z-score of John who scored 190 b) Fin

denpristay [2]

Answer:

a) $Z = -0.8$

b) $Z = 2.4$

c) Mary's score was 241.25.

Step-by-step explanation:

Problems of normally distributed samples can be 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:

$\mu = 210, \sigma = 25$