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2 years ago

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Từ điểm A ở ngoài (O) kẻ các tiếp tuyến AB, AC với đường tròn (B và C là các tiếp điểm), BC cắt OA tại D, trên cung nhỏ BC lấy E

, ED cắt (O) tại F chứng minh góc BAE = góc CAF

1 answer:

Neko [114]2 years ago

4 0

I don’t understand what is that

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Which segment of the triangle will give you the height of your peak? Write the equation for the proportion that will allow you t

Novosadov [1.4K]

The segment that will give the height of the peak is the segment that is located from the right angle to the peak.
To find the height, we can use the fact that we have two similar triangles.
We are going to define a variable.
We have:
x: height of the peak.
For similar triangles, we have the following relationship:
$\frac{x}{20} = \frac{6}{3}$
From here, we clear the height of the peak
Answer:
the equation for the proportion that will allow you to find the height of your peak is:
$\frac{x}{20} = \frac{6}{3}$

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3 years ago

Perform the indicated operations:

Damm [24]

Answer:

A= -40

B= 16

C= 40

D= 50

Step-by-step explanation:

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2 years ago

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X + 69 = 79 what does "x" equal? explain the answer!

Shkiper50 [21]

When finding x, you need to balance the equation.

To balance the equation, you need to do the inverse to the other side to get x all by itself.

x+69(-69)= 79(-69)

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I hope this helps!
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3 years ago

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Suppose we want to determine the minimum sample size required to give us a 95% confidence interval that estimates, to within $50

Firlakuza [10]

Answer:

The minimum sample size is 610.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Population standard deviation is $6300, so $\sigma = 6300$

Suppose we want to determine the minimum sample size required to give us a 95% confidence interval that estimates, to within $500, the average salary of a state employee.

This is n when M = 500. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$500 = 1.96*\frac{6300}{\sqrt{n}}$

$500\sqrt{n} = 1.96*6300$

$\sqrt{n} = \frac{1.96*6300}{500}$

$(\sqrt{n})^{2} = (\frac{1.96*6300}{500})^{2}$

$n = 609.89$

Rouding up

The minimum sample size is 610.

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3 years ago

what is the 360 cubic inch cakes or fourth inches thick and any whole number length and width are possible how many different ca

bagirrra123 [75]

25+1.99 (32)=cost of the cake.
1.99×32=$63.68
$63.68+25=$88.68
The cake would cost $88.68

7 0

2 years ago