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olasank [31]
3 years ago
7

WILL MARK BRAINLIEST FOR CORRECT ANSWER.

Mathematics
2 answers:
kiruha [24]3 years ago
7 0

Short Answer

It's A

Solution

A

2/3 x - 2 = 1/3 x                             Subtract 2/3x from both sides

2/3x - 2/3x - 2 = 1/3x - 2/3 x        Combine like terms

- 2 = - 1/3 x                                    Multiply both sides by - 3

- 2  * - 3 = 3 * - 1/3 x

- 6 = - x                                          Multiply by -1

x = 6

B

B looks like the same thing, but the 2 is a plus 2. When you solve for x you go through exactly the same steps. Your answer becomes - 6

C

C adds 2/3 x to both sides. The result is x = - 2

D same as C only x = 2

Phoenix [80]3 years ago
3 0

I would simplify each equation and then plug in 6 for x.

A.) \frac{2}{3}x-2= \frac{1}{3} x  Subtract 2/3x on both sides

\frac{2}{3}x-2- \frac{2}{3}x= \frac{1}{3}x-\frac{2}{3}x

-2=-\frac{1}{3}x  Now you plug in 6

-2=-\frac{1}{3} (6)

-2 = -\frac{6}{3}

-2 = -2


x = 6 is the solution for choice A

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A grading scale is set up for 1000 students' test scores. It assumes the
astra-53 [7]

Answer:

464 students will score between 48 and 75. Using the z-distribution, we measure how many standard deviations each score is from the mean, then find the p-value associated with each score to find the proportion, and from the proportion, we find how many out of 1000.

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.

It assumes the scores are normally distributed with a mean score of 75 and a standard deviation of 15.

This means that \mu = 75, \sigma = 15

How many students will score between 48 and 75?

First we find the proportion, which is the pvalue of Z when X = 75 subtracted by the pvalue of Z when X = 48. So

X = 75

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

Z = \frac{75 - 75}{15}

Z = 0

Z = 0 has a p-value of 0.5

X = 48

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

Z = \frac{48 - 75}{15}

Z = -1.8

Z = -1.8 has a p-value of 0.0359

1 - 0.0359 = 0.4641

Out of 1000:

0.4641*1000 = 464

464 students will score between 48 and 75. Using the z-distribution, we measure how many standard deviations each score is from the mean, then find the p-value associated with each score to find the proportion, and from the proportion, we find how many out of 1000.

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Answer:Isolate the variable by dividing each side by factors that don't contain the variable.

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