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3 years ago

How do i find x in #21

Mathematics

1 answer:

Cerrena [4.2K]3 years ago

8 0

In quadrilaterals inscribed in circles, the sum of opposite angles=180 degrees. so, x+134=180

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Researchers are studying the distribution of subscribers to a certain streaming service in different populations. From a random

Katen [24]

Answer:

$CI = (0.17 - 0.27)\± 1.65\sqrt{\frac{(0.17)*(0.83) + (0.27)*(0.73)}{200}}$

Step-by-step explanation:

Given

$n = 200$

$x_1 = 34$ -- City C

$x_2 = 54$ --- City K

Required

Determine the 90% confidence interval

This is calculated using:

$CI = \bar x \± z\frac{\sigma}{\sqrt n}$

Calculating $\bar x$

$\bar x = \bar x_1 - \bar x_2$

$\bar x = \frac{x_1}{n} - \frac{x_2}{n}$

$\bar x = \frac{34}{200} - \frac{54}{200}$

$\bar x = 0.17 - 0.27$

For a 90% confidence level, the z-score is 1.65. So:

$z = 1.65$

Calculating the standard deviation $\sigma$

$\sigma = \sqrt{(\bar x_1)*(1 - \bar x_1) + (\bar x_2)*(1 - \bar x_2) }$

So:

$\sigma = \sqrt{(0.17)*(1 - 0.17) + (0.27)*(1 - 0.27) }$

$\sigma = \sqrt{(0.17)*(0.83) + (0.27)*(0.73)}$

So:

$CI = (0.17 - 0.27)\± 1.65\frac{\sqrt{(0.17)*(0.83) + (0.27)*(0.73)}}{\sqrt {200}}$

$CI = (0.17 - 0.27)\± 1.65\sqrt{\frac{(0.17)*(0.83) + (0.27)*(0.73)}{200}}$

7 0

2 years ago

X- 18 = 0<br> Number of real number solutions

Neko [114]

Answer:

X= 18

Step-by-step explanation:

18-18=0

x=18

5 0

3 years ago

Read 2 more answers

Find the product (x-y)(6x+4y)

Mazyrski [523]

The product means you multiply, so:
-y × 6x = -6xy
-y × 4y = -4y²

x × 6x = 6x²
x × 4y = 4xy

= -2xy - 4y² + 6x

I hope this helps!

7 0

3 years ago

Simplify the algebraic expression by combining like (or similar) terms.<br> -7x - 8y- 5x - 6y

stira [4]

Answer:

-12x - 14y

Step-by-step explanation:

First I would move them side by side so I can see it better so:

-7x - 5x - 8y - 6y

now combine the x values together and the y values together:

-12x - 14y

7 0

3 years ago

Read 2 more answers

What is the simplest radical form of square root of 80?

Pani-rosa [81]

√(80)=√(4*20)=√(4*4*5)=4√5

7 0

3 years ago