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4 years ago

-2⁄3 a − 6 = 12 a = I need help

1 answer:

4 0

So first you are gonna add +6 on both sides
-2/3a-6=12
now you will get -2/3a=18
then you are gonna multiply -2/3 on both sides leaving the "a" alone
(-2/3)-2/3a=18(-2/3)
now you will get a=-12 and that will be your answer.

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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:

Step(I):-

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

Test statistic Z=0.13008 < 1.645 at 0.1 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

7 0

3 years ago

57.33 is 80% of what number?

Leni [432]

45.864, because 57.33 divided by 100 is 0.5733 that multiplied by 80 is 45.864

4 0

3 years ago

1. A football team gains 2 yards on the first play,

Ilya [14]

Option C

The football team had a overall loss of 2 yards

Solution:

When the team gains yards we use a positive value, and when the team loses yards we use a negative value.

Given that, football team gains 2 yards on the first play

First play = +2

Given that football team loses 5 yards on the second play

Second play = -5

Given that football team loses 3 yards on the third play

Third play = -3

Given that football team gains 4 yards on the fourth play

Fourth play = +4

Put the yards from four plays together, we get

⇒ 2 -5 -3 + 4

Let us simplify

⇒ -3 -3 + 4 = -6 + 4 = -2

So, -2 represents loss of two yards (since negative value indicates loss)

3 0

4 years ago

9. Eight friends went to a hockey game. The

Ira Lisetskai [31]

Answer:

y = 8x + 4(6)

y = 8x + 24

Step-by-step explanation:

8 friends bought tickets to a hockey game at $x

4 of them also bought a guide book at $6

If y = total cost

8 people bought tickets and 4 bought guides.

Then simplify by multiplying 4 and 6.

8 0

3 years ago

Find the congruent line segments

mash [69]

AB and EF
BC and FD
AC and ED

4 0

3 years ago