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BigorU [14]
3 years ago
14

Which graph correctly represents (5/2)x - y < 3?

Mathematics
2 answers:
katrin [286]3 years ago
4 0

(5/2)x - y < 3

-y < -(5/2)x + 3

y > (5/2)x - 3

The answer is B

Setler79 [48]3 years ago
3 0

You can rewrite the inequality as

y > \cfrac{5}{2}\ x - 3

Note that

y = f(x) = \cfrac{5}{2}\ x - 3

is the equation of the line drawn in the pictures. This means that, for every point on the line, the y coordinate is exactly image of the x coordinate, i.e. f(x)

The inequality is satisfied by all points whose y coordinate exceeds the image of the x coordinate. Since the y axis is positively oriented upwards, a greater value for the y coordinate means that the point has to be higher than the line.

Also, since the equality inlves a > and not a \geq sign, the line itself is excluded.

So, the correct graph is the second one.

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Your percentile is (a hundred times) the probability that another score is less than your score.  We have a normal distribution, so that probability is the integral of the standard normal from negative infinity to our normalized score.  

Let's call the percentile rank p, already scaled between zero and 1.

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We know 68% of the probability will be between -1 and +1 standard deviation.  So z=-1 corresponds to p=.5-.68/2=.16 and
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That's about the list I can do off the top of my head. I think three standard deviations is 99.7%. For the rest we just consult a z table or integrated normal table.  We find p in the body of the table (maybe |.5-p| depending on the table) and then the column headings tell us our z score.

In this modern age, your computer can do this for you quickly

8 0
3 years ago
At a meeting with 25 businessmen, twelve businessmen drank coffee, and ten businessmen drank tea. Five businessmen drank both co
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Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

5 0
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