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3 years ago

Solve for x: 9x - 3 = -39 a -6 b -4 c 9 d 5

Mathematics

2 answers:

ahrayia [7]3 years ago

8 0

9x - 3 = -39
9x = -39 + 3
9x = -36
x = -36/9
x = -4

Answer: b -4

Nesterboy [21]3 years ago

8 0

Hi there.

9x - 3 = -39

First, we need to isolate our variable. To do this, we have to add 3 to both sides as we are subtracting 3 from 9x, and adding 3 cancels it out.

-3 + 3 = 0
-39 + 3 = -36

We now have:
9x = -36

All we have to do now is divide both sides by 9 as we have 9 multiplying our variable, and as we previously mentioned, performing the opposite order of operations cancels the other out.

9x / 9 = x
-36 / 9 = -4

We have our solution:
x = -4

I hope this helps!

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Answer:

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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.

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