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3 years ago

9

What is a random sampling

1 answer:

Masja [62]3 years ago

8 0

Random sampling is when you select a random group of people for something.

Ex. Out of a population of 259,096 people, a random sample of 400 people are choosen.

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Find a quadratic polynomial with integer coefficients which has x = 2/9, ± SQRT23/9 as its real zeros.

melomori [17]

Answer:

The quadratic polynomial with integer coefficients is $y = 81\cdot x^{2}-36\cdot x -19$ .

Step-by-step explanation:

Statement is incorrectly written. Correct form is described below:

<em>Find a quadratic polynomial with integer coefficients which has the following real zeros: </em> $x = \frac{2}{9}\pm \frac{\sqrt{23}}{9}$ <em>. </em>

Let be $r_{1} = \frac{2}{9}+\frac{\sqrt{23}}{9}$ and $r_{2} = \frac{2}{9}-\frac{\sqrt{23}}{9}$ roots of the quadratic function. By Algebra we know that:

$y = (x-r_{1})\cdot (x-r_{2}) = x^{2}-(r_{1}+r_{2})\cdot x +r_{1}\cdot r_{2}$ (1)

Then, the quadratic polynomial is:

$y = x^{2}-\frac{4}{9}\cdot x -\frac{19}{81}$

$y = 81\cdot x^{2}-36\cdot x -19$

The quadratic polynomial with integer coefficients is $y = 81\cdot x^{2}-36\cdot x -19$ .

5 0

3 years ago

Robert wants to put lights around the edge of his deck. The deck is 46 feet long and 23 feet wide. How many yards of lights does

Korolek [52]

46 yards is the answer

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3 years ago

Write a multiplication expression that has a product of 7^15

Alina [70]

There are a few answers but an example of one could be 7^10 * 7^5

hope this helps

6 0

2 years ago

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3. There were 15,876 fans at the first MLS soccer game and 13,759 at the second game. How many more fans were at the first game?

laila [671]

Answer:

2117 more fans

Step-by-step explanation:

So, all you do is just subtract 15,876 from 13,759, which gives 2117 more fans.

Hope I helped !!!

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3 years ago

Which of the following shows the number of time 3 1/5 fits into 10 1/2

ollegr [7]

The answer is 0.304762

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4 years ago

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