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3 years ago

OMG I NEED HELP!!!!!

Mathematics

2 answers:

Aliun [14]3 years ago

7 0

Answer:

Step-by-step explanation:

9/3=3, so if you divide 18/3, you get 6.

Hope this helps you out!! Have a wonderful day :3

Setler [38]3 years ago

5 0

Answer:

Step-by-step explanation:

This type of problem is a lot easier when you break it down a bit.

First, we know that 9:18 is equal to 1:2 (this is just simplifying by dividing by 9)

So, what's 2*3? 6

Alternatively, you can reason that 9/3 = 3 and 18/3=6

Hope this helps!

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Given the following discrete uniform probability distribution, find the expected value and standard deviation of the random vari

katovenus [111]

The expected value is

$E[X]=\displaystyle\sum_xx\,P(X=x)=\frac1{11}\sum_{x=0}^{10}x=\dfrac{0+1+\cdots+9+10}{11}=\dfrac{55}{11}=\boxed{5}$

The standard deviation is the square root of the variance, which is

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

where

$E[X^2]=\displaystyle\sum_xx^2\,P(X=x)=\frac1{11}\sum_{x=0}^{10}x^2=\dfrac{0^2+1^2+\cdots+9^2+10^2}{11}=\dfrac{385}{11}=35$

so that

$V[X]=35-5^2=10$

making the standard deviation

$\sqrt{V[X]}=\sqrt{10}\approx\boxed{3.16}$

3 0

3 years ago

4b^2-4b=-1 A)0 B)1 C)2 D)3

Solnce55 [7]

Answer:

Step-by-step explanation:

Take out 4 from each term on the left.

4(B^2 - B) = -1 Divide both sides by 4

4(B^2 - B)/4 = - 1/4

(B^2 - B) = -1/4 Add 1/4 to both sides

B^2 - B + 1/4 = - 1/4+1/4

B^2 - B + 1/4 = 0

(b - 1/2)(b - 1/2)

This has 2 equal roots of (b - 1/2)(b - 1/2) or b = 1/2 , b = 1/2.

When that happens, the quadratic just touches the x axis (in this case at 1/2)

I've provided a graph to show you how this happens. None of your choices are what I'm getting. The answer is 1/2 no matter how it is factored.

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3 years ago

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Cerrena [4.2K]

◆ SEQUENCE AND SERIES ◆

Heya !

Check the attachment.
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3 years ago

Select the expressions that are equivalent to 7(x+2).

OlgaM077 [116]

Answer:

Step-by-step explanation:

7-2=x

7-2=5

x=5

.........................

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3 years ago

Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.

Taya2010 [7]

Answer:

Segment DE is half the length of segment AC. -- Substitution property of equality

Step-by-step explanation:

Here is given a proof for proving line joining mid segment is parallel and half the length of third side.

Stepwise proof is given in two columns

We find that for every line there is a justification as

STatement Justification

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This justification was missing in the given proof and with this included proof would be complete

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3 years ago

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