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White raven [17]

2 years ago

7

Need answer ASAP, Like right now the quiz is timed

2 answers:

erica [24]2 years ago

6 0

Answer:

<u>-6r + 6</u> is equivalent to 8 - ( 6r +2 )

Step by step explanation-

8 - ( 6r + 2 )

= 8 - 6r - 2

= 8 - 2 - 6r

= 6 - 6r

<h3> $\boxed{= - 6r + 6}$ </h3>

Gwar [14]2 years ago

3 0

Answer:

The first one

Step-by-step explanation:

-6r+6 would be the answer

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Random variables X Poisson~ ( a) ,Y Poisson ~ ( a) . X and Y are independent. If 2 1, 2 1. U =2X+ Y-1, V=2X- Y +1. Find: ) Cov (

german

By definition of covariance,

$\mathrm{Cov}(U,V)=E[(U-E[U])(V-E[V])]=E[UV-E[U]V-UE[V]+E[U]E[V]]=E[UV]-E[U]E[V]$

Since $U=2X+Y-1$ and $V=2X-Y+1$ , we have

$E[U]=2E[X]+E[Y]-1$

$E[V]=2E[X]-E[Y]+1$

$\implies E[U]E[V]=(2E[X]+E[Y]-1)(2E[X]-(E[Y]-1))=4E[X]^2-(E[Y]-1)^2=4E[X]^2-E[Y]^2+2E[Y]-1$

and

$UV=(2X+Y-1)(2X-(Y-1))=4X^2-(Y-1)^2=4X^2-Y^2+2Y-1$

$\implies E[UV]=4E[X^2]-E[Y^2]+2E[Y]-1$

Putting everything together, we have

$\mathrm{Cov}(U,V)=(4E[X^2]-E[Y^2]+2E[Y]-1)-(4E[X]^2-E[Y]^2+2E[Y]-1)$

$\mathrm{Cov}(U,V)=4(E[X^2]-E[X]^2)-(E[Y^2]-E[Y]^2)$

$\mathrm{Cov}(U,V)=4V[X]-V[Y]=4a-a=\boxed{3a}$

7 0

4 years ago

What is the slope-intercept of this graph? Zoom in to find the slope intercept

solniwko [45]

Answer:

y = -3/2 x + 3

Step-by-step explanation:

The line touches the y-intercept at 3 and then goes down 3 units (-3) and then right 2 units.

8 0

3 years ago

Please help!!<br><br>(y+5)^3

Lera25 [3.4K]

the answer is 58 8.........

7 0

4 years ago

Read 2 more answers

What decimal best represents an elevation of 2,000.288 feet below sea level

choli [55]

I believe the answer is -2,000.288 feet but im not 100% sure. hope this helps, have an amazing day :)

3 0

4 years ago

If your invest $150 at 7% interest compounded annually,in how many years will you have $400?. Give your answer of the nearest te

taurus [48]

Answer:

14.5 years.

Step-by-step explanation:

Given that you invest $150 at 7% interest compounded annually. Now we need to find about in how many years will you have $400. Then round the answer ot the nearest tenth of a year.

So plug the given values into compound interest formula.

$A=P\left(1+r\right)^t$

$400=150\left(1+0.07\right)^t$

$\frac{400}{150}=\left(1+0.07\right)^t$

$\ln\left(\frac{400}{150}\right)=\ln\left(1+0.07\right)^t$

$\ln\left(\frac{400}{150}\right)=\ln\left(1.07\right)^t$

$\ln\left(\frac{400}{150}\right)=t\cdot\ln\left(1.07\right)$

$\frac{\ln\left(\frac{400}{150}\right)}{\ln\left(1.07\right)}=t$

$14.4967313882=t$

Which is approx 14.5 years.

8 0

4 years ago