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horsena [70]
3 years ago
5

Simplify the expression: 9r + -5r + 7 - 4 + -2r + -4

Mathematics
2 answers:
olga nikolaevna [1]3 years ago
7 0

Answer:

2r-1

I would appreciate if my answer is chosen as a brainliest answer

Amiraneli [1.4K]3 years ago
4 0
The photo has an answer for you

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If f(x)=x2-25and g(x)=x-5 ,what is the domain of (f/g)(x)?
djyliett [7]

Answer:

Find the domain.

Interval Notation:

(−∞,5)∪(5,∞)

Set-Builder Notation:

{x|x≠5}

3 0
3 years ago
How many times does 3 go into 36
evablogger [386]
36 divided by 3 = 12

3 goes into 36 twelve times.
8 0
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I don't know how to turn 200 kids into a percent
malfutka [58]
Divide 47 by 100. you will get a decimal. move the decimal two places the right and there is your percent!
7 0
3 years ago
The area of a rectangle in 24 square units. A diagonal drawn from one corner to another divides the rectangle into two right tri
mamaluj [8]

Answer:

12

Step-by-step explanation:

24/2=12

the triangles are congruent

3 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
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