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2 years ago

Help me please i dont understand it

Mathematics

1 answer:

Mekhanik [1.2K]2 years ago

8 0

Answer:

6 u^4 v^2 (5 y^9 + 4 u^4 v^6)

Step-by-step explanation:

factoring basically means to take out the things that they have in common and put it outside of the parenthesis

when my says something like u^4 it means 4 is an exponent of u

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Ax over b plus cx over d equals e <br> solve for x

Lorico [155]

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3 years ago

Cindy claims that 4^x/12^x = 1/3<br> What is a single-digit whole number that supports her claim?

Lana71 [14]

Answer:

x=1

Step-by-step explanation:

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2 years ago

What is the slope of the line

ELEN [110]

Answer:

The slope = 2

Step-by-step explanation:

Slope is rise over run.

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2 years ago

4. A random variable X has a mean of 10 and a standard deviation of 3. If 2 is added to each value of X, what will the new mean

Ede4ka [16]

Adding 2 to each value of the random variable $X$ makes a new random variable $X+2$ . Its mean would be

$E[X+2]=E[X]+E[2]=E[X]+2$

since expectation is linear, and the expected value of a constant is that constant. $E[X]$ is the mean of $X$ , so the new mean would be

$E[X+2]=10+2=12$

The variance of a random variable $X$ is

$V[X]=E[X^2]-E[X]^2$

so the variance of $X+2$ would be

$V[X+2]=E[(X+2)^2]-E[X+2]^2$

We already know $E[X+2]=12$ , so simplifying above, we get

$V[X+2]=E[X^2+4X+4]-12^2$

$V[X+2]=E[X^2]+4E[X]+4-12^2$

$V[X+2]=(V[X]+E[X]^2)+4E[X]-140$

Standard deviation is the square root of variance, so $V[X]=3^2=9$ .

$\implies V[X+2]=(9+10^2)+4(10)-140=9$

so the standard deviation remains unchanged at 3.

NB: More generally, the variance of $aX+b$ for $a,b\in\mathbb R$ is

$V[aX+b]=a^2V[X]+b^2V[1]$

but the variance of a constant is 0. In this case, $a=1$ , so we're left with $V[X+2]=V[X]$ , as expected.

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3 years ago

Which facts are true for the graph of the function below? Check all that apply.

yarga [219]

Answer:

its F, D, E, and C

Plz mark brainliest if this helps

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2 years ago

Help me please i dont understand it ​

Help me please i dont understand it