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3 years ago

Please help I will give brainliest.

Mathematics

2 answers:

Tatiana [17]3 years ago

5 0

Answer:

There are $6\frac{2}{3}$ three-eights in 2 $\frac{1}{2}$ .

Step-by-step explanation:

Hope this helps please give Brainliest!

deff fn [24]3 years ago

3 0

B (second choice) it just makes sense when u think about it

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G with the definition of covariance, prove cov[(ay − b),(cy − d)] = accov(x, y ), where x, y are random variables and a, b, c, d

____ [38]

By definition of covariance,

$\mathrm{Cov}(X,Y)=\mathbb E[(X-\mathbb E[X])(Y-\mathbb E[Y])]$

$\mathrm{Cov}(X,Y)=\mathbb E[XY-\mathbb E[X]Y-X\mathbb E[Y]+\mathbb E[X]\mathbb E[Y]]=\mathbb E[XY]-\mathbb E[X]\mathbb E[Y]$

We have

$\mathbb E[(aX-b)(cY-d)]=\mathbb E[acXY-adX-bcY+bd]$

$=ac\mathbb E[XY]-ad\mathbb E[X]-bc\mathbb E[Y]+bd$

$\mathbb E[aX-b]=a\mathbb E[X]-b$

$\mathbb E[cY-d]=c\mathbb E[Y]-d$

$\mathbb E[aX-b]\mathbb E[cY-d]=ac\mathbb E[X]\mathbb E[Y]-ad\mathbb E[X]-bc\mathbb E[Y]+bd$

Putting everything together, we find the covariance reduces to

$\mathrm{Cov}(aX-b,cY-d)=ac(\mathbb E[XY]-\mathbb E[X]\mathbb E[Y])=ac\mathrm{Cov}(X,Y)$

as desired.

5 0

3 years ago

If one side of a cube measures x cm what is the volume

Inessa05 [86]

Answer:

The volume is x times x times x which is x^3 :)

7 0

3 years ago

Piper works at a camera store. He paid an hourly rate plus 16% commission on everything he sells. One week, he paid $365 for wor

Vlada [557]

+5
1500 * 0.16 = 240
365 - 240 = 125
125 / 20 = 6.25 per hour

3 0

3 years ago

Please answer honestly : )

FrozenT [24]

Answer:

D) J

B) point Q

Step-by-step explanation:

we know that the ginipigs are only given 80 in total. that means 80 is 100%

40÷80*100=50%

20÷80*100=25%

10÷80*100= 12.5%

all this together is 100%

meaning the best answer is

Q is the only place that = -1/2

3 0

3 years ago

Need help I will mark you brainlist

meriva

Answer:

ummm i belive its b

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers