All categories

2 years ago

Can someone help me?

Mathematics

1 answer:

nasty-shy [4]2 years ago

5 0

The scale factor is x2 or 100. 2 times 2 is 4 and n

You might be interested in

This one is number 6

iren2701 [21]

I’m not entirely sure, but i do think it could be B.

5 0

2 years ago

Read 2 more answers

2. The following triangle, ∆, has angle measures as shown.

klio [65]

Answer:

x=29. Angle C= 93

Step-by-step explanation:

3(x+2)= 3x+6.

3x+6+52+35= 3x+93.

180-93=87.

87/3= 29. So that means x=29.

for proof you can do 3(29)+93 and you'll get 180.

For angle C; 3(29+2)= 3x31. 31x3= 93.

Angle C= 93 degrees.

6 0

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.

5 0

3 years ago

Someone please help and show work!! I will also mark brainliest. I’ll appreciate it.

Eduardwww [97]

Answer:

1. 53

2. 20

3. 37

4. 29

Step-by-step explanation:

Since your trying to find the hypotenuse you equation is...

1. 28^2 + 45^2 = C^2

784 + 2025 = C^2

Square Root 2809= C^2

C=53

So after you square root 2809 you get 53.

2. 12^2 + 16^2 = C^2

144 + 256 = C^2

Square Root 400 = C^2

C=20

So after you square root 400 you get 40.

3. 12^2 + 35^2 = C^2

144 + 1225 = C^2

Square Root 1369 = C^2

C=37

So after you square root 1359 you get 37.

4. 20^2 + 21^2 = C^2

400 + 441 = C^2

Square root 841 = C^2

C=20

So after you square root 841 you get 29.

5 0

2 years ago

In the diagram below, BD is parallel to XY What is the value of y?

elena55 [62]

Answer:

$y =110^\circ$

Step-by-step explanation:

Given

See attachment for diagram

Required

Find y

From the attachment, 70 and y are interior angles.

So:

$70 + y = 180$

Solve for y

$y = 180 - 70$

$y =110^\circ$

5 0

2 years ago