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lions [1.4K]
4 years ago
10

Please help I'm so lost!!! Factor. 9x2−49y2

Mathematics
1 answer:
pantera1 [17]4 years ago
4 0

Answer:

(3x+7y)(3x−7y)

Step-by-step explanation:

Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) where a=3x and b=7y

Umm if you need more details just ask.

Hope this helps .-.

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In a randomly selected sample of 100 students at a University, 81 of them had access to a computer at home. Give the value of th
astra-53 [7]

Answer:

The value of the standard error for the point estimate is of 0.0392.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

In a randomly selected sample of 100 students at a University, 81 of them had access to a computer at home.

This means that n = 100, p = \frac{81}{100} = 0.81

Give the value of the standard error for the point estimate.

This is s. So

s = \sqrt{\frac{0.81*0.19}{100}} = 0.0392

The value of the standard error for the point estimate is of 0.0392.

7 0
3 years ago
5. Consider the diagram below. Solve for x.
mrs_skeptik [129]

Answer:

41 degrees

Step-by-step explanation:

The three angles need to add up to 180 degrees!

4 0
3 years ago
PLEASE HELP! ASAP! no links please
adoni [48]
From left to right it’s 1, 49, 9, 70
7 0
3 years ago
Help me please again lol :> here's a picture
Delvig [45]

Answer:

It's Same perimeter only

Step-by-step explanation:

It can't be the other two because they don't share the same area

4 0
2 years ago
Read 2 more answers
PLEASE HELP IM GIVING BRAINLIEST<br> one thing that's for sure its not C) 5 2/9
Tanzania [10]

Answer:

D) 5 4/9

Step-by-step explanation:

\frac{19}{9}+(\frac{-2}{9})+\frac{32}{9}\\\frac{19-2}{9}+\frac{32}{9}\\\frac{17+32}{9}=\frac{49}{9}=5\frac{4}{9}

4 0
3 years ago
Read 2 more answers
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