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kaheart [24]
3 years ago
7

Simplify the expression (x+5)(-7)

Mathematics
2 answers:
Serggg [28]3 years ago
5 0
(x+5)(-7)
Distributhing -7 through parantheses
x*(-7)+5(-7)
-7x-35
The answer is: -7x-35
mezya [45]3 years ago
4 0
(x+5)(-7) = -7(x+5) = -7x - 35
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Will give brainliest please help ASAP
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✿  Domain is the Set of Values of x

⇒ Domain = { 10 , 15 , 19 , 32 }

✿ Range is the Set of Values of y (Images of x)

⇒ Range = { -1 , 5 , 9 }

First Option is the Answer

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3 years ago
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Imagine an experiment having three conditions and 20 subjects within each condition. The mean and variances of each condition ar
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Answer:

1. Mean square B= 5.32

2. Mean square E= 16.067

3. F= 0.33

4. p-value: 0.28

Step-by-step explanation:

Hello!

You have the information of 3 groups of people.

Group 1

n₁= 20

X[bar]₁= 3.2

S₁²= 14.3

Group 2

n₂= 20

X[bar]₂= 4.2

S₂²= 17.2

Group 3

n₃= 20

X[bar]₃= 7.6

S₃²= 16.7

1. To manually calculate the mean square between the groups you have to calculate the sum of square between conditions and divide it by the degrees of freedom.

Df B= k-1 = 3-1= 2

Sum Square B is:

∑ni(Ÿi - Ÿ..)²

Ÿi= sample mean of sample i ∀ i= 1,2,3

Ÿ..= general mean is the mean that results of all the groups together.

General mean:

Ÿ..= (Ÿ₁ + Ÿ₂ + Ÿ₃)/ 3 = (3.2+4.2+7.6)/3 = 5

Sum Square B (Ÿ₁ - Ÿ..)² + (Ÿ₂ - Ÿ..)² + (Ÿ₃ - Ÿ..)²= (3.2 - 5)² + (4.2 - 5)² + (7.6 - 5)²= 10.64

Mean square B= Sum Square B/Df B= 10.64/2= 5.32

2. The mean square error (MSE) is the estimation of the variance error (σ_{e}^2 → S_{e} ^{2}), you have to use the following formula:

Se²=<u> (n₁-1)S₁² + -(n₂-1)S₂² + (n₃-1)S₃²</u>

                        n₁+n₂+n₃-k

Se²=<u> 19*14.3 + 19*17.2 + 19*16.7 </u>= <u>  915.8   </u>  = 16.067

                 20+20+20-3                  57

DfE= N-k = 60-3= 57

3. To calculate the value of the statistic you have to divide the MSB by MSE

F= \frac{Mean square B}{Mean square E} = \frac{5.32}{16.067} = 0.33

4. P(F_{2; 57} ≤ F) = P(F_{2; 57} ≤ 0.33) = 0.28

I hope you have a SUPER day!

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3 years ago
A class is made up of 8 boys and 4 girls. Half of the girls wear glasses. A student is selected at random from the class. What i
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Answer:

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Step-by-step explanation:

The total amount of people 8+4=12

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the probability to chhose a girl with glasses is 2/12=1/6

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The answer is 33 percent

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Answer:

3.1

Step-by-step explanation:

5 x5 =25

25+3=28

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