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3 years ago

40 POINTS PLS HELP!!!! C and B

Mathematics

2 answers:

vichka [17]3 years ago

8 0

Answer:

Did you already finish this? If so thx for the points if not i am srry

Step-by-step explanation:

monitta3 years ago

7 0

Answer:

What are you saying I am confused

Step-by-step explanation:

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What is a career that you can use for adding and subtracting fractions

xenn [34]

Answer:

A math teacher

Step-by-step explanation:

6 0

3 years ago

In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the fol

Julli [10]

Answer:

$0.071,1.928$

Step-by-step explanation:

Downtown Store North Mall Store

Sample size n 25 20

Sample mean $\bar{x}$ $9 $8

Sample standard deviation s $2 $1

$n_1=25\\n_2=20$

$\bar{x_1}=9\\ \bar{x_2}=8$

$s_1=2\\s_2=1$

$x_1-x_2=9-8=1$

Standard error of difference of means = $\sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}$

Standard error of difference of means = $\sqrt{\frac{2^2}{25}+\frac{1^2}{20}}$

Standard error of difference of means = $0.458$

Degree of freedom = $\frac{\sqrt{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}})^2}{\frac{(\frac{s_1^2}{n_1})^2}{n_1-1}+\frac{(\frac{s_2^2}{n_2})^2}{n_2-1}}$

Degree of freedom = $\frac{\sqrt{(\frac{2^2}{25}+\frac{1^2}{20}})^2}{\frac{(\frac{2^2}{25})^2}{25-1}+\frac{(\frac{1^2}{20})^2}{20-1}}$

Degree of freedom =36

So, z value at 95% confidence interval and 36 degree of freedom = 2.0280

Confidence interval = $(x_1-x_2)-z \times SE(x_1-x_2),(x_1-x_2)+z \times SE(x_1-x_2)$

Confidence interval = $1-(2.0280)\times 0.458,1+(2.0280)\times 0.458$

Confidence interval = $0.071,1.928$

Hence Option A is true

Confidence interval is $0.071,1.928$

4 0

2 years ago

Chapter 1: Quadrati

Bad White [126]

Answer:

mid point of AB (0.5 , 0)

Step-by-step explanation:

2x + 5y = 1 2x = 1 - 5y

y = 2xy+ 5 = (1 - 5y)*y + 5 = y - 5y² + 5

y-y = y - 5y² + 5 - y = - 5y² + 5

0 = - 5y² + 5

5y² = 5

y² = 1

y = 1 or y = -1

if y = 1 x = 1/2 (1 - 5) = -2 .... point A (-2 , 1)

if y = -1 x = 1/2 (1 + 5) = 3 ..... point B (3 , -1)

mid point of AB (x' , y') : x' = 1/2 (x₁ + x₂) = 1/2 (-2 + 3) = 1/2

y' = 1/2 (y₁ + y₂) = 1/2 (-1 + 1) = 0

8 0

3 years ago

3) Triangles ABE, ADE and CBE are shown on the coordinate grid, and all the vertices have coordinate integers. Which statement i

Olenka [21]

Answer:

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3 years ago

3x18 = 3 (10+8) is an example of the _________ property of multiplication.

Mariulka [41]

Answer:

3x18 = 3 (10+8) is an example of the commutative property of multiplication

Step-by-step explanation:

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3 years ago