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3 years ago

Which expression is equivalent to (3/x-2) -5 divided by 2-(4/x-2) ?

Mathematics

2 answers:

Scrat [10]3 years ago

6 0

Answer: I it’s D

Step-by-step explanation:I did the assignment

Zanzabum3 years ago

4 0

The answer is the last one. D

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The Community College Survey of Student Engagement reports that 46% of the students surveyed rarely or never use peer or other t

kap26 [50]

Answer:

d) No, this would not be unusual because 46% is only 1.2 standard errors from 40%.

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.

If the z-score is higher than 2 or lower than -2, X is unusual.

In this question:

Mean = 40%. So $\mu = 0.4$

Standard error = 5%. So $\sigma = 0.05$

Is 46% unusual?

We have to find Z when X = 0.46. So

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

$Z = \frac{0.46 - 0.4}{0.05}$

$Z = 1.2$

1.2 is lower than 2, that is, it is only 1.2 standard deviations from the mean. So 46% is not unusual.

So the correct answer is:

d) No, this would not be unusual because 46% is only 1.2 standard errors from 40%.

3 0

3 years ago

50% of population does not smoke, 20% are heavy smokers and 30% are light smokers. if heavy smokers are twice as likely to die a

Sidana [21]

Based on the calculation below, the likelihood that if someone died they were a heavy smoker is 42.11%.

<h3>How do we calculate the likelihood of an occurrence?</h3>

Let:

Likelihood that a non-smoker will die = x

Therefore, we have:

Likelihood that a light smoker will die = 2 * x = 2x

Likelihood that a heavy smoker will die= 2 * 2x = 4x

From the above, we have:

Expected number of non smokers that will die = 50% * x = 0.5x

Expected number of light smokers that will die = 30% * 2x = 60%x = 0.6x

Expected number of heavy smokers that will die = 20% * 4x = 80%x = 0.8x

Total expected = 0.5x + 0.6x + 0.8x = 1.9x

Therefore, we have:

Likelihood that a heavy smoker died = Expected number of heavy smokers that will die / Total expected = 0.8x / 1.9x = 0.4211, or 42.11%

Learn more about likelihood here: brainly.com/question/14832179.

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8 0

1 year ago

PLEASE HELP!!!!!!!!!!!!

andrezito [222]

Answer:

1) $160

2) 20 girls

Step-by-step explanation:

Hope this helps!

4 0

4 years ago

What is f(-3) if f(x) = |2x - 1| - 5?

Orlov [11]

Answer: f(x)=|2x+1|+5

f(-3) = |2*-3 + 1|+5

= |-6 + 1|+5

= |-5|+5 = 5 + 5 = 10

f(-3) = 10

Step-by-step explanation: GIVE ME BRAINLY A THANKS AND A VOTE HOPE I HELPED BYE

3 0

4 years ago

There are 36 playing tag at recess. this is 6 times as many playing hopscotch. which model shows this comparison?

irakobra [83]

Answer:

The top left one is correct.

Step-by-step explanation:

We can rewrite this as an algebraic expression simply so it's easier to read.

Let's say hopscotch is $h$ . Tag is 6 times $h$ , or $6h$ .

That means for every 1 unit of hopscotch, there are 6 units of tag.

The top left one is correct.

6 0

3 years ago