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3 years ago

9

Any large random sample from a group of people will be representative of the entire group.

1 answer:

Grace [21]3 years ago

6 0

False.

In a random sample each member of the group has the same chances to be choosen. A representative sample replicates the characteristcs that you want of the group. Many times you need to make the sampling not random to pick a sample that represents or replicates the group.

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Find lim x→3 sqrt 2x+3-sqrt 3x/ x^2-3x. you must show your work or explain your work in words plsss I need help

sineoko [7]

I'm assuming the limit is supposed to be

$\displaystyle\lim_{x\to3}\frac{\sqrt{2x+3}-\sqrt{3x}}{x^2-3x}$

Multiply the numerator by its conjugate, and do the same with the denominator:

$\left(\sqrt{2x+3}-\sqrt{3x}\right)\left(\sqrt{2x+3}+\sqrt{3x}\right)=\left(\sqrt{2x+3}\right)^2-\left(\sqrt{3x}\right)^2=-(x-3)$

so that in the limit, we have

$\displaystyle\lim_{x\to3}\frac{-(x-3)}{(x^2-3x)\left(\sqrt{2x+3}+\sqrt{3x}\right)}$

Factorize the first term in the denominator as

$x^2-3x=x(x-3)$

The $x-3$ terms cancel, leaving you with

$\displaystyle\lim_{x\to3}\frac{-1}{x\left(\sqrt{2x+3}+\sqrt{3x}\right)}$

and the limand is continuous at $x=3$ , so we can substitute it to find the limit has a value of -1/18.

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3 years ago

What is the next item in the sequence −10,−3,4,11

TEA [102]

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▹ Answer

<em>18</em>

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▹ Step-by-Step Explanation

- 10 + 7 = -3

-3 + 7 =4

4 + 7 = 11

11 + 7 = 18

Hope this helps!

- CloutAnswers ❁

Brainliest is greatly appreciated!

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3 years ago

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How many T-shirt’s did he sell?

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Aliun [14]

They each would pay 2.55

12.75 divided by 5 = 2.55

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3 years ago

Find the angle whose cosine is .4203

ludmilkaskok [199]

The cosine of 1.137020412 degrees is 0.4204.

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