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katen-ka-za [31]
3 years ago
14

Yall I’m actually going to cry I’m having trouble understanding this please helpp please

Mathematics
1 answer:
Lelechka [254]3 years ago
8 0

Answer:

I was gonna help you, but no one didn''t help meeeeeee and i am cryinggggg!!!!

Step-by-step explanation:

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The sentence three times the difference of -13 and 2 amounts to -45 written as an equation
Alinara [238K]

3(-13-2)= -45

Step-by-step explanation:

We need to write the equation of:

three times the difference of -13 and 2 amounts to -45 written as an equation

The equation is:

3(-13-2)= -45

Keywords: Convert Sentence into Equations

Learn more about Converting Sentence into Equations:

  • brainly.com/question/10708697
  • brainly.com/question/4687435

#learnwithBrainly

7 0
3 years ago
The random variable x has the following probability distribution: x f(x) 0 .25 1 .20 2 .15 3 .30 4 .10 a. Is this probability di
Reptile [31]

Answer and Explanation:

Given : The random variable x has the following probability distribution.

To find :

a. Is this probability distribution valid? Explain and list the requirements for a valid probability distribution.

b. Calculate the expected value of x.

c. Calculate the variance of x.

d. Calculate the standard deviation of x.

Solution :

First we create the table as per requirements,

x      P(x)         xP(x)           x²            x²P(x)

0    0.25           0               0                0

1     0.20        0.20             1              0.20

2    0.15          0.3               4             0.6

3    0.30         0.9               9             2.7

4    0.10          0.4               16             1.6

   ∑P(x)=1     ∑xP(x)=1.8               ∑x²P(x)=5.1

a) To determine that table shows a probability distribution we add up all five probabilities if the sum is 1 then it is a valid distribution.

\sum P(X)=0.25+0.20+0.15+0.30+0.10

\sum P(X)=1

Yes it is a probability distribution.

b) The expected value of x is defined as

E(x)=\sum xP(x)=1.8

c) The variance of x is defined as

V=\sum x^2P(x)-(\sum xP(x))^2\\V=5.1-(1.8)^2\\V=5.1-3.24\\V=1.86

d) The standard deviation of x is  defined as

\sigma=\sqrt{V}

\sigma=\sqrt{1.86}

\sigma=1.136

5 0
2 years ago
If 3 times a number is decreased by 12, the result is 5
Nadusha1986 [10]
3 times a # (# isn't specified, so you should use a variable): 3x
result is 5: =5
Put it all together: 3x=5
6 0
3 years ago
For
Dmitry [639]

Answer:

8 in^2.

Step-by-step explanation:

F = P * A

22 = 2.75 * A

A = 22/ 2.75

A = 8 in^2.

8 0
2 years ago
How many ml are needed to prepare 750 my a 1:250 solution
adell [148]
Im sorry but this question is not worded right
3 0
2 years ago
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