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3 years ago

I need help on how to solve this, it says these are not special right triangles

Mathematics

2 answers:

yulyashka [42]3 years ago

8 0

The triangles shown are similar, so
.. 12/x = x/8
.. x^2 = 12*8 = 96
.. x = √96
.. x = 4√6 ≈ 9.798

Tom [10]3 years ago

6 0

The answer is ............................ go to school

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A group of researchers wants to know whether men are more likely than women to contract a novel coronavirus. They surveyed two r

olasank [31]

Answer:

Test statistic Z= 0.13008 < 1.96 at 0.10 level of significance

null hypothesis is accepted

There is no difference proportion of positive tests among men is different from the proportion of positive tests among women

Step-by-step explanation:

<em>Step(I)</em>:-

Given surveyed two random samples of 390 men and 360 women who were tested

first sample proportion

$p_{1} = \frac{360}{390} = 0.9230$

second sample proportion

$p_{2} = \frac{47}{52} = 0.9038$

Step(ii):-

Null hypothesis : H₀ : There is no difference proportion of positive tests among men is different from the proportion of positive tests among women

Alternative Hypothesis:-

There is difference between proportion of positive tests among men is different from the proportion of positive tests among women

$Z = \frac{p_{1}- p_{2} }{\sqrt{PQ(\frac{1}{n_{1} }+\frac{1}{n_{2} } } }$

where

$P = \frac{n_{1}p_{1} +n_{2} p_{2} }{n_{1}+n_{2} }$

P = 0.920

$Z= \frac{0.9230-0.9038}{\sqrt{0.920 X0.08(\frac{1}{390}+\frac{1}{52} } )}$

Test statistic Z = 0.13008

Level of significance = 0.10

The critical value Z₀.₁₀ = 1.645

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3 years ago

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IgorC [24]

$55\%\ of\ 164\ is...\\\\ \frac{55}{100} \times \frac{164}{1} =\\\\55*164=9020\\100*1=100\\\\ \frac{9020}{100}\approx90\\\\20\ is\ left\ over.\\\\90.20\\\\\\55\%\ of\ 164\ is\ 90.2$

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3 years ago

PLZ HLP Given the equation 5x + y = 7, which equation below would cause a consistent-independent system?

DanielleElmas [232]

Answer:

the equation D ) would cause a consistent-independent system.

Step-by-step explanation:

A ) 5 x + y = 7 /*( -2 )

10 x + 2 y = 14

--------------------

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10 x + 2 y = 14

------------------------

0 x = 0 ( Dependent system )

B ) 5 x + y = 7 / * 3

- 15 x - 3 y = - 6

--------------------------

15 x + 3 y = 21

- 15 x - 3 y = - 6

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0 x = 15 ( Inconsistent system )

C ) 5 x + y = 7

5 x + y = - 7 / * ( - 1 )

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5 x + y = 7

- 5 x - y = 7

------------------

0 x = 14 ( Inconsistent system )

D ) 5 x + y = 7 / * ( - 2 )

6 x + 2 y = 7

------------------

- 10 x - 2 y = - 14

6 x + 2 y = 7

-----------------------

- 4 x = - 7; x = 7/4; y = - 7/4

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2 years ago