only need help on number 1

Answer:

i dont know have an amazing day

Step-by-step explanation:

be kind ppl

Answer:

B should be where C is, C is A, and A is B

Answer:

The 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is between $140.39 and $309.11

Step-by-step explanation:

Sample mean:

Sum of all values divided by the number of values. So

[tex]S_{m} = \frac{249+349+299+249+149+135+199+169}{8} = 224.75[/tex]

Confidence interval:

We have the standard deviation for the population, so the z-distribution is used.

We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:

[tex]\alpha = \frac{1 - 0.995}{2} = 0.0025[/tex]

Now, we have to find z in the Ztable as such z has a pvalue of [tex]1 - \alpha[/tex].

That is z with a pvalue of [tex]1 - 0.0025 = 0.9975[/tex], so Z = 2.807.

Now, find the margin of error M as such

[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]

In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.

[tex]M = 2.807\frac{85}{\sqrt{8}} = 84.36[/tex]

The lower end of the interval is the sample mean subtracted by M. So it is 224.75 - 84.36 = $140.39

The upper end of the interval is the sample mean added to M. So it is 224.75 + 84.36 = $309.11

The 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is between $140.39 and $309.11

Answer:

(-3,4,-2)

Step-by-step explanation:

Answer:

x=0

Step-by-step explanation:

that's all , all the best

Answer:

(y+1/2  ; y)

Step-by-step explanation:

hello :  all  ordered pair is a solution of the linear equation x=y+1/2;(-5,-2) is :

(y+1/2  ; y)

(-5 ; -2) is not  solution because y = -2  but  -2+1/2 = -3/2 no -5

9514 1404 393

Answer:

  see attached

Step-by-step explanation:

12. The first attachment has the rate of change on each interval. (It is listed at the end of the interval.) It is computed by dividing the difference in length by the corresponding difference in months. The units of rate of change are inches per month.

The baby was growing fastest in the first 3 months.

__

13. The first attachment has the rate of change on each interval. It is computed by dividing the difference in height by the corresponding difference in seconds. The units of rate of change are meters per second. A negative number indicates the elevator is going down.

The second attachment shows a graph of the distance versus time.

_____

I find it convenient to let a spreadsheet do repetitive calculations. I can enter the formula once and copy it where needed. I don't have to worry about the accuracy of the arithmetic, and the result can be formatted to suit the problem requirements. (The basics of most spreadsheet programs can be learned in a few minutes.)

Answer:

The rate of change of the surface area of the sphere is 0.99 cm²/s.  

Step-by-step explanation:

The surface area (A) of a sphere is given by:

[tex] A = 4\pi r^{2} [/tex]                      

If we derivate the above equation with respect to the time we have:

[tex] \frac{dA}{dt} = 4\pi (2r)\frac{dr}{dt} [/tex]

[tex] \frac{dA}{dt} = 8\pi r\frac{dr}{dt} [/tex]    (1)

Where:          

r: is the radius    

We need to find [tex]\frac{dr}{dt}[/tex] and r.

From the volume we can find the radius:

[tex] V = \frac{4}{3}\pi r^{3} = 256 \frac{\pi}{3} cm^{3} [/tex]  

[tex] r = \sqrt[3]{\frac{3V}{4\pi}} = \sqrt[3]{\frac{3*256*\frac{\pi}{3}}{4\pi}} = 4 cm [/tex]                

And by derivating the volume of the sphere with respect to the time we can calculate [tex]\frac{dr}{dt}[/tex]:  

[tex]\frac{dV}{dt} = \frac{4}{3}\pi(3r^{2})\frac{dr}{dt}[/tex]

[tex]\frac{dV}{dt} = 4\pi r^{2}\frac{dr}{dt}[/tex]          

[tex] \frac{dr}{dt} = \frac{\frac{dV}{dt}}{4\pi r^{2}} = \frac{2}{4\pi(4)^{2}} = 0.0099 cm/s [/tex]      

Now, we can calculate the rate of change of the surface area (equation 1):

[tex] \frac{dA}{dt} = 8\pi r\frac{dr}{dt} = 8\pi*4*0.0099 = 0.99 cm^{2}/s [/tex]

Therefore, the rate of change of the surface area of the sphere is 0.99 cm²/s.  

I hope it helps you!          

Infinitely many passwords can be made.

There are 45,697,600 different passwords.

To multiply means to add a number to itself a particular number of times. Multiplication can be viewed as a process of repeated addition.

Since, Fundamental counting principle states that if there are p ways to do a thing, and q ways to do another thing, and these two things are independent,

Then, there are p x q ways to do both things.

Hence, In this question:

3 letters, each with 26 possible options(ways).

Two digits, each with 10 possible options.

One digit, with 26 possible options.

And, Each digit/letter is independent,

Thus, Number of ways are;

26 x 26 x 26 x 10 x 10 x 26 = 45,697,600

Thus, There are 45,697,600 different passwords are possible,

Learn more about the multiplication visit:

https://brainly.com/question/10873737

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Answer:

[tex] \displaystyle {9}^{2x - 1} = 2[/tex]

Step-by-step explanation:

we are given a logarithmic equation

[tex] \displaystyle \log_{9}(2) = 2x - 1[/tex]

we want to rewrite it as exponential equation

remember that,

[tex] \displaystyle\log_{a}(b) = c \iff {a}^{c} = b[/tex]

here our a is 9,b is 2 and c is 2x-1

altogether

our exponential equation is

[tex] \displaystyle {9}^{2x - 1} = 2[/tex]

and we're done!

The measure of A is: 78°

Answer:

10 and 12

Step-by-step explanation:

the LCM of 10 and 12 is 60

10 and 12 have 2 as the least common factor between them

Answer:

D. (1,6)

Step-by-step explanation:

Vertical line segment:

A vertical line segment has fixed x coordinate.

In this question:

Vertical line segment that is 4 units long and is connected to (1,2).

The x-coordinate is x = 1.

The y-coordinate can be y = 2 - 4 = -2 or y = 2 + 4 = 6.

(1,6) is one of the options, so the correct answer is given by option D.

Answer:

a)ab and yz, ac and xy, bc and xz

b)yz  =   xy  =   xz          30 = 37.5 = 45      3 = 3 = 3      

ab      ac        bc          40     50       60     4    4    4

c)they are similar because all sides break down to ¾  

Step-by-step explanation: this is what i did on my test

Answer:

B) SA = 984 cm²

Step-by-step explanation:

SA = (2 x 13 x 24) + (10 x 24) + (10 x 12) = 984 cm²

Answer:

They're both cool but I personally like the first one better lol

Answer:

C.

Step-by-step explanation:

Answer:

y = 45

Step-by-step explanation:

2y+1+y+112+112=360

3y+225=360

3y=135

y=45

Answer: I put it in my calendar and i got 45 hope this helps

Step-by-step explanation:

pleas make brainly

Answer: $566.40 ($5,286.40 in total)

Step-by-step explanation: This is a multiplication problem. You multiply .12 by 4,720.

(also, i'm doing your math instead of mine in my math class, so you're welcome)

Answer:

197 adult tickets and 354 child tickets were sold for the event.

Step-by-step explanation:

Given that the Family Fine Arts Center charges $ 22 per adult and $ 14 per child under 12 years old for its performances, and on a recent weekend evening when 551 people paid admission, the total receipts were $ 9290, to determine how many who paid were children under 12 years old the following calculation must be performed:

22 - 14 = 8

551 x 14 = 7.714

9,290 - 7,714 = 1,576

1,576 / 8 = 197

551 - 197 = 354

197 x 22 + 354 x 14 = X

4.334 + 4.956 = X

Therefore, 197 adult tickets and 354 child tickets were sold for the event.

Answer:

16.25 mL

Step-by-step explanation:

Since we are mixing from the syrup in the inventory, we can say that the syrup in the inventory must be equal to that in the final solution. Thus, we will use the dilution equation to solve for the Initial volume;

Dilution equation is;

V₁C₁ = V₂C₂

Where;

V₁ is initial volume

C₁ is initial concentration or initial molarity

V₂ is final volume

C₂ is final concentration of final molarity

We are given;

C₁ = 80% = 0.8

C₂ = 60% = 0.6

V₂ = 65 mL

Making V₁ the subject in the dilution equation, we have;

V₁ = (V₂C₂)/C₁

V₁ = (65 × 0.6)/0.8

V₁ = 48.75 mL of inventory syrup

Since we have 48.75 mL of inventory syrup and the dilute solution is 65 ml, then the volume of soda solution required = 65mL - 48.75 mL = 16.25 mL

a. The interest earned is $307.40.

b. The balance of the account after 4 years is $1982.40.

Simple interest is a type of interest that is calculated only on the principal amount of a loan or investment. It is a fixed percentage of the principal amount that is added to the loan or investment balance over a specified period of time.The formula for simple interest is:

I = P * r * t

In finance, the term "principal" usually refers to the initial amount of money that is borrowed or invested, excluding any interest or other fees that may be added on later.

In the given question,

a. To find the interest earned, we can use the formula:

Interest = Principal x Rate x Time

where Principal is the initial amount of money, Rate is the interest rate, and Time is the duration of the investment. Plugging in the given values, we get:

Interest = $1675 x 0.046 x 4

Interest = $307.40

Therefore, the interest earned is $307.40.

b. To find the balance of the account, we simply add the interest earned to the initial amount:

Balance = Principal + Interest

Balance = $1675 + $307.40

Balance = $1982.40

Therefore, the balance of the account after 4 years is $1982.40.

To know more simple interest, visit:

https://brainly.com/question/30824126

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Step-by-step explanation:

Answer:

x = 49°, and y = 63°

Step-by-step explanation:

Starting with x, you can see that it is in a corner where two lines cross each other.  That means that x is equal to the angle on the other side of that intersection, which we are given.  x then, is equal to 49°

And with y, You'll notice that is formed with two lines, a horizontal one and and a diagonal one.  At he bottom of the shape you can see another horizontal one intersecting with the same diagonal one.  Notice also that the two lines use the ">" symbol, noting that the lines are parallel.  Because those lines are parallel, the angles between each of those and the diagonal one are the same.  This tells us that y is equal to 63°

a 713

498

215

hope it will help

The required missing values are 6, 0, and -5 respectively in the sum (a).

The required missing values are 4, 11, and -4 respectively in the sum (b).

The analysis of mathematical representations is algebra, and the handling of those symbols is logic.

Let the missing terms x, y and y in the given sum,

_  x , 1 , 3

   4 , y , 8

_________

   2   1    z

As per the fundamental algebra,

x - 4 = 2 | 1 - y = 1 | 3 - 8 = z

x = 2 + 4 | y = 1 - 1 | z = -5

x = 6| y = 0 | z = -5

Let the missing terms a, b, and c in the given sum,

_  7 , b , 5

   a , 3 , 9

_________

   3   8    c

As per the fundamental algebra,

7 - a = 3 | b - 3 = 8 | 5 -9 = c

a = 7 - 3 | b = 8 + 3 | c = 5 - 9

a = 4 | b = 11 | c = -4

Thus, the required missing values are 6, 0, and -5 respectively in the sum (a). The required missing values are 4, 11, and -4 respectively in the sum (b).

To learn more about the Algebra link is given below.

brainly.com/question/953809

#SPJ2

Answer:

450 days

Step-by-step explanation:

4500/10 = 450 days

Answer:

24 in

Step-by-step explanation:

Perimeter is the sum of all side lengths

10 in + 6 in + 8 in = 24 in

24 in is the perimeter

If my answer is incorrect, pls correct me!

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-Chetan K