Need help with my Math homework

Answer:

The 90% confidence interval is  [tex] 0.0097 <  p_1 -p_2 < 0.0773 [/tex]

Step-by-step explanation:

From the question we are told that

   The first  sample size is [tex]n_1 =  620[/tex]

    The number of chips that failed is  k = 125

   The second sample size is [tex]n_2  =  820[/tex]

    The number of chips that fail is  [tex]u  = 130[/tex]

Generally the confidence level is  90% , hence the level of significance is  

    [tex]\alpha =  (100 - 90)\% [/tex]

=>  [tex]\alpha = 0.10 [/tex]

Generally from the normal distribution table the critical value  of  [tex]\frac{\alpha }{2}[/tex] is  

   [tex]Z_{\frac{\alpha }{2} } =  1.645[/tex]

Generally the first sample proportion is  

       [tex]\r p _1 =  \frac{125}{620}[/tex]

=>     [tex]\r p _1 = 0.202[/tex]

Generally the second  sample proportion is  

       [tex]\r p _1 =  \frac{130}{820}[/tex]

=>     [tex]\r p _1 = 0.1585[/tex]

Generally the standard error is mathematically represented as

[tex]SE =  \sqrt{\frac{\r p_1 (1 - \r  p_1)}{n_1} +\frac{\r p_2 (1 - \r  p_2)}{n_2}  }[/tex]    

=> [tex]SE =  \sqrt{\frac{0.202(1 - 0.202)}{620} +\frac{0.1585 (1 - 0.1585)}{820}  }[/tex]  

=>  [tex]SE = 0.0206[/tex]  

Generally the margin of error is mathematically represented as  

      [tex]E = Z_{\frac{\alpha }{2} } * SE[/tex]

=>     [tex]E = 1.645 * 0.0206[/tex]

=>    [tex]E =0.0338[/tex]

Generally 95% confidence interval is mathematically represented as  

      [tex](\r p_1 -\r p_2) -E <  p_1 - p_2 <  (\r p_1 -\r p_2) +E [/tex]

=>    [tex](0.202 -0.1585) -0.0338 <  p_1 - p_2 < (0.202 -0.1585) +0.0338 [/tex]

=>    [tex] 0.0097 <  p_1 - p_2 < 0.0773 [/tex]

Answer:

x=12 pls give brainliest

Step-by-step explanation:

Answer: x = 12, Angle 1 = 38°

Step-by-step explanation: Complimentary angles add up to 90°.

Add the two angles and set them equal to 90°:

(3x + 2) + (4x + 4) = 90

Add like terms:

7x + 6 = 90

Subtract 6 from both sides:

7x = 84

Divide both sides by 7:

x = 12

Now, to get Angle 1, plug x in:

Angle 1 = 3(12) + 2

Angle 1 = 38°

Hope this helps!

Answer:

  x = 6

Step-by-step explanation:

Using the relationships between the entries in the table, you can find x two different ways.

The numbers down the Total column add to give the one at the bottom:

  0.1 + 0.09x = 0.64

  0.09x = 0.54 . . . . . . . subtract 0.1

  x = 6 . . . . . . . . . . . . divide by 0.9

__

The product of the numbers in the first two columns is the number in the third. On the bottom row, this means ...

  (2 +x)(0.08) = 0.64

  2 +x = 8 . . . . . . . . . . . divide by 0.08

  x = 6 . . . . . . . . . . . subtract 2

Answer:

y = 2x + 4

Step-by-step explanation:

the equation of a line in point- slope form is

y = mx + c ( m is the slope and c the y- intercept )

here m = 2 and passes through point (0, 4 ) ⇒ c = 4

y = 2x + 4 ← equation of line

Answer:

y = 2x + 4

Step-by-step explanation:

General form of linear equation:  y = mx + c

where m is the gradient and c is the y-intercept

Given gradient = 2  

⇒  m = 2  

⇒  y = 2x + c

y-intercept is when x = 0

Given (0, 4), so y = 4 when x = 0

⇒ c = 4

⇒ y = 2x + 4

ANSWER

thirteen point zero eight five

Answer:

1.05

There you go!

Answer:

-1 and 3

Step-by-step explanation:

The roots of the quadratic function can be determined by [tex]f(x')=0[/tex] where x' is the roots of the quadratic function. In that graph, x = -1 and x = 3 makes the value of f(-1) = 0 and f(3) = 0. So, x = -1 and x = 3 are the roots of the f(x).

Answer:

i domisa

Step-by-step explanation:

Answer: Mike's weekly allowance is 20 dollars

Step-by-step explanation:

Answer:

180 in²

Step-by-step explanation:

base b = 2 ft = 2*12 in = 24 in

height h = 15 in

Area = bh/2 = 24 * 15/2 = 180 in²

Answer:

b,d

Step-by-step explanation:

Answer:

-17j - 7m

Step-by-step explanation:

combine like terms -9j - 8j = -17j, there is no like term for -7m

Step-by-step explanation:

1. A+B=Just add the J hat with J hat and add the I hat with the I hat.

[tex](3i + ( - 1)i + ( - 2) + ( - 4)j = 2i - 6j[/tex]

A-B=

[tex]3 - ( - 1)i + ( - 2) - ( - 4)j = 4i + 4j[/tex]

2. Take the magnitude of A+B

[tex]2 {}^{2} + ( - 6) {}^{2} = {r}^{2} [/tex]

[tex]40 = {r}^{2} [/tex]

[tex]r = \sqrt{40} [/tex]

So the magnitude is root of 40.

So the magnitude of A+B is

The magnitude of A-B

[tex] {4}^{2} + {4}^{2} = 4 \sqrt{2} [/tex]

So the magnitude is

[tex]4 \sqrt{2} [/tex]

c. To find direction, we need to find the angle.

Use this rule,

[tex] \tan(x) = \frac{bj}{bi} [/tex]

For A+B, we get

[tex] \tan(x )= \frac{ - 6}{2} [/tex]

[tex] \tan(x) = - 3[/tex]

Since this is a southeast, the degree is 288.43.

The direction is southeast, 288.43 degrees

For A-B, we get

[tex] \tan(x) = \frac{4}{4} [/tex]

[tex] \tan(x) = 1[/tex]

Since this is northeast, the degree is 45 degrees.

The direction is northeast, 45 degrees.

Answer:

2x - 3y = 6

[tex]x = 3 + \frac{3y}{2}[/tex]

[tex]y = 2 + \frac{2x}{3}[/tex]

4y - x = 12

[tex]x = 12 + 4y\\y = 3 + \frac{x}{4}[/tex]

Step-by-step explanation:

Divide both sides of the equation to "solve for x and y."

Answer:

the container will hold 3m cudic meters

Answer:

c is the answer

Step-by-step explanation:

i don't have one

Answer:  161 m^2

Step-by-step explanation:

The surface area composes of 4 triangles and 1 square.

The side length of the square is 7 m, so the area is 49 m^2 because the area of a square is the side length^2.

Each of the triangles has a base of length 7 m and a height of 8 m, so the area of each triangle is 7m*8m/2 = 28 m^2 because the area of a triangle is the base*height/2.

Since there are 4 triangles, the total surface area of the 4 triangles is 28 m^2 * 4 = 112 m^2.

Adding that to the area of the square, we get 49 m^2 + 112 m^2 = 161 m^2

Answer:

its about 5 gallons

Step-by-step explanation:

because the feets how are for the times its 4 or 5 if its 4 it cant go until 1400 and if its 5 theres left paint

Answer:

angle mnp

Step-by-step explanation:

i think it is helpful

Given that each package contains 9 trading cards.

Packages                                      Trading cards

2                                                      18

4                                                      36

7                                                      63

Answer:

38.4 ft

Step-by-step explanation:

Basically, draw out your two Situations like I have did.

Then find the scale factor by doing 6/40.

Multiply the SF by 256 to get X, or the shadow of the woman.

The screenshot provided shows the drawings.

the last one is the line expression who shows the distance from 2 to negative 5

Option D is the correct answer.

We need to identify which number line expression shows how to find the distance from 2 to -5.

A line on which numbers are marked at intervals is used to illustrate simple numerical operations.

If we see option D, it has been marked correctly at 2 and -5.

Therefore, option D is the correct answer.

To learn more about the number line visit:

https://brainly.com/question/13189025.

#SPJ5

Answer:

Part 1. 7 inches (longer piece)

Part 2: 5 inches (shorter piece)

Step-by-step explanation:

There is 12 inches in total, given that one piece is 5 inches longer, the other part of the 5 inches would be 7 inches which is the longer side.

5 inches would be the shorter side.

Step-by-step explanation:

I think this is the answers. hope it helps you

Divide the number of defective by the total number of batteries then multiply by 100 to get the percent.

18/150 = 0.12

0.12 x 100 = 12%

Answer: 12%

Answer:

x-intercept(s):

(

4

,

0

)

y-intercept(s):

(

0

,

−

4

)

Step-by-step explanation:

The changes in lowe's dollars of gross profit and gross profit percentages as seen in fiscal 2019 is due to;

The gross profit margin is known to be that which informs a person what their business has made after paying their direct cost of doing business.

This is made up of labor, materials and other kinds of direct production costs. It is known to be a key element in profitability ratios along with operating profit margin and net profit margin.

The Iowe's company was said to have posted that they made about 2.6 percent in terms of sales growth and the fiscal 2019 shows that they had the highest sales and adjusted diluted earnings per share since the start of the company.

See options below

a. Sales volume increased in fiscal 2019, but unit costs decreased.

b. Sales volume decreased in fiscal 2019, and per unit selling prices decreased.

c. Sales volume increased in fiscal 2019, and unit costs increased.

d. Sales volume and unit costs did not change, but per unit selling prices increased.

Learn more about gross profit from

https://brainly.com/question/15530787

Answer:

468 ft²

Step-by-step explanation:

Area= (sum of the 2 parallel sides÷2)×perpendicular height

=(15+37)÷2×18

=52÷2×18

=468

The price elasticity of demand for the parakeet chow is 1.33.

Price elasticity of demand is the change in product quantity demanded to change in price.

From the question:

[tex]\%\ Change\ in \ quantity=\frac{30000-40000}{30000}= -33.3\%\\\\\%\ Change\ in \ price=\frac{20-16}{16}= 25\%\\\\PED=|\frac{\%\ Change\ in \ quantity}{\%\ Change\ in \ price} |=|\frac{-33.3\%}{25\%}|=1.33[/tex]

The price elasticity of demand for the parakeet chow is 1.33.

Find out more on elasticity of demand at: https://brainly.com/question/24384825

Answer:

how to understand the problem is picture the shape as a house and try to figure out what to do next

Step-by-step explanation: