Last​ year, a person wrote 120 checks. Let the random variable x represent the number of checks he wrote in one​ day, and assume that it has a Poisson distribution. What is the mean number of checks written per​ day? What is the standard​ deviation? What is the​ variance?

Answer:

0.00005

Step-by-step explanation:

you move 5 decimal places left starting from 7 and right it as a decimal.

Ans=0.00007

Simultaneous equations are a set of equations that are solved together to determine the values of the variables that satisfy both equations.

1) 4x + 5y = 3 ---(1)

y - 3x = -7 ----(2)

Using the substitution method;

y = -7 + 3x ----(3)

Thus

4x + 5(-7 + 3x) = 3

4x -35 +15x = 3

19x - 35 = 3

19x = 3 + 35

x = 2

Then

4(2) + 5y = 3

8 + 5y = 5

y = 13/5

y = 2 3/5

2) 2x - 4y = 24 ----- x 3

  -3x + 2y = -48 ----- x 2

   6x - 12 y = 72 ---- (3)

  -6x + 4y = -96 ---- (4)

Add 3 and 4

         16y = -24

y = -24/16

Substitute y = -24/16 into (1)

2x - 4(-24/16) = 24

2x + 6 = 24

x = 15

3) -x + y = 13 --- 1

  3x - 4y = 46 ---- 2

y = 13 + x ---- 3

Substitute 3 into 2

3x - 4(13 + x) = 46

3x - 52 - 4x = 46

-x - 52 = 46

x = 98

Substitute x = 98 into (1)

-98 + y = 13

y = 13 + 98

y = 111

Let C be x and D be y

x + y = 180

x = 33 + 6y

x - 6y = 33

x = 180 - y

Substitute and obtain;

180 - y - 6y = 33

180 - 7y = 33

y = 33 - 180/-7

y = 21

Then

x + 21 = 180

x = 180 - 21

x = 159

Lastly

Let small = x , medium = y

x + y = 150

4x + 6y = 764

x = 150 - y

4(150 - y) + 6y = 764

600 - 4y + 6y = 764

600 + 2y = 764

2y = 764 - 600

y = 82

Then;

x + 82 = 150

x = 68

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The solutions to the simultaneous equations are:

1) x = 2 and y = -1

2) x = 18 and y = 3

3) y = -7 and x = 6

There are three main methods in solving simultaneous equations and they are:

1) Elimination Method

2) Substitution Method

3) Graphical Method

1) 4x + 5y = 3

y = 3x - 7

Substitute 3x - 7 for y in the first equation to get:

4x + 5(3x - 7) = 3

4x + 15x - 35 = 3

19x - 35 = 3

19x = 35 + 3

19x = 38

x = 38/19

x = 2

Thus:

y = 3(2) - 7

y = -1

2) 2x - 4y = 24

-3x + 2y = -48

Multiply eq 2 by 2 and eq 1 by 1 to get:

2x - 4y = 24    -----(3)

-6x + 4y = -96   -----(4)

Add eq 3 to eq 4 to get:

-4x = -72

x = 18

2(18) - 4y = 24

36 - 4y = 24

36 - 24 = 4y

4y = 12

y = 3

3) -x + y = -13

3x - 4y = 46

From eq 1, x = y + 13

Thus:

3(y + 13) - 4y = 46

3y + 39 - 4y = 46

39 - y = 46

y = 39 - 46

y = -7

x = -7 + 13

x = 6

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As a ladybug on the outer surface of the Klein bottle, there is no direct path to the inside. However, you can travel along a specific type of curve called a "cross-cap curve" to reach the inside. and using topology.

To do this, start by moving along the outer surface of the Klein bottle until you reach the point directly opposite to your starting position. Then, imagine folding the surface of the bottle in half along a line that runs through this point.

This folding will create a new surface that intersects with the original surface of the bottle along a cross-cap curve. Follow this curve until you reach the inside of the Klein bottle, where the special gentleman bug is waiting for you.

It's important to note that the Klein bottle is a non-orientable surface, which means that there is no "inside" or "outside" in the traditional sense. However, the concept of inside and outside can still be useful for navigation purposes.

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Answer:

2 wholes 3 tenths and 5 hundredths

Step-by-step explanation:

An equation in standard form passing through the points (3, -6) and (1, -2) is 2x + y = -3.

In Mathematics, the point-slope form of a straight line can be calculated by using the following mathematical expression:

y - y₁ = m(x - x₁) or [tex]y - y_1 = \frac{(y_2- y_1)}{(x_2 - x_1)}(x - x_1)[/tex]

Where:

At data point (3, -6), a linear equation in slope-intercept form for this line can be calculated by using the point-slope form as follows:

[tex]y - y_1 = \frac{(y_2- y_1)}{(x_2 - x_1)}(x - x_1)\\\\y +6 = \frac{(-2+6)}{(1 -3)}(x -3)[/tex]

y + 6 = -2(x - 3)

y = -2x + 3 - 6

y = -2x - 3

2x + y = -3

In this context, we can reasonably infer and logically deduce that an equation of the line that represents this table in standard form is 2x + y = -3.

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Step-by-step explanation:

the width is 23.5ft and the length is 47ft

The inequality that determines the maximum number of speakers, x, Michael can buy is: B. $46.00 + $483.33 < $1,045.69

To determine the maximum number of speakers, x, Michael can buy without spending more money than he has in his account, we need to use the following inequality:

Total amount spent on TV and speakers ≤ amount of money in the account

We know that Michael has $1,045.69 in his account, and he will spend $483.33 on a new television. Let x be the maximum number of speakers he can buy. Each speaker costs $46.00, so the total amount spent on the speakers will be $46.00x. Thus, we can write the inequality as:

$483.33 + $46.00x ≤ $1,045.69

Simplifying this inequality, we get:

$46.00x ≤ $1,045.69 - $483.33

$46.00x ≤ $562.36

x ≤ $562.36 ÷ $46.00

x ≤ 12.20 (rounded to two decimal places)

So the maximum number of speakers Michael can buy without spending more money than he has in his account is 12.20. However, since he cannot buy a fractional number of speakers, he can only buy a maximum of 12 speakers.

Therefore, the correct inequality that determines the maximum number of speakers, x, Michael can buy without spending more money than he has in his account is:

B. $46.00 + $483.33 < $1,045.69

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Mathematics provides a framework for developing critical thinking, problem-solving, and analytical skills that are valuable in many aspects of life.

What is mathematics?

Mathematics is a fundamental discipline that plays a crucial role in our daily lives and in shaping our understanding of the world.

Mathematics is a field of study that deals with the properties and relationships of numbers, quantities, shapes, and patterns. It involves using logical reasoning, abstraction, and symbolic manipulation to understand and solve problems related to these concepts.

Mathematics is important for many reasons. First and foremost, it is a fundamental tool for understanding and describing the world around us. It plays a crucial role in science, technology, engineering, economics, finance, and many other fields by providing tools for modeling and analyzing complex phenomena.

Mathematics is also essential for making accurate predictions and decisions based on data and evidence, as well as for designing and optimizing systems and processes.

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The tοtal change in reservοir height οver bοth years is a decrease οf 2 feet.

The tοtal change in reservοir height οver bοth years can be calculated by finding the difference between the final height and the initial height.

Let's assume that the initial height οf the reservοir was H.

After the lοng dry spell, the reservοir drοpped 6 feet, which means its height became H - 6.

Fοllοwing that, the reservοir rοse 4 feet, which means its height became (H - 6) + 4 = H - 2.

Therefοre, the tοtal change in reservοir height οver bοth years can be calculated as:

Tοtal change = Final height - Initial height

= (H - 2) - H

= -2

Sο the answer is C) -0+. The tοtal change in reservοir height is a decrease οf 2 feet.

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Answer:

0.0093 square inches

Step-by-step explanation:

Kenny will spend $4,593.75 on fencing the dilated rectangle.

What is rectangle ?

A rectangle is a quadrilateral with four right angles (90-degree angles) and opposite sides of equal length. It is a type of parallelogram in which both pairs of opposite sides are parallel and congruent (of equal length). The opposite sides of a rectangle are also perpendicular (form a right angle) to each other. The area of a rectangle is equal to the product of its length and width, while its perimeter is equal to the sum of the lengths of all its sides. Rectangles are commonly used in geometry, architecture, engineering, and many other fields.

According to the question:
Since each unit on the graph represents 25 feet, the dimensions of the original rectangle ABCD are:

AB = 4 units, which represents 4 x 25 = 100 feet

BC = 3 units, which represents 3 x 25 = 75 feet

Therefore, the perimeter of ABCD is 2(AB + BC) = 2(100 + 75) = 350 feet.

When dilating by a scale factor of 2.5, each dimension of ABCD will be multiplied by 2.5. Therefore, the dimensions of the dilated rectangle A'B'C'D' are:

A'B' = AB x 2.5 = 100 x 2.5 = 250 feet

B'C' = BC x 2.5 = 75 x 2.5 = 187.5 feet

The perimeter of A'B'C'D' is 2(A'B' + B'C') = 2(250 + 187.5) = 875 feet.

Therefore, Kenny will need to fence a perimeter of 875 feet. At a cost of $5.25 per foot, the total cost of fencing will be:

875 feet x $5.25/foot = $4,593.75

Therefore, Kenny will spend $4,593.75 on fencing the dilated rectangle.

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Answer:

627422410000

hope it helps

Answer:

117

Step-by-step explanation:

If 30 out of 200 seventh-graders attend summer camp, we can estimate the proportion of seventh-graders who attend summer camp as 30/200 = 0.15.

To estimate how many seventh-graders out of the total of 780 are expected to attend summer camp, we can multiply this proportion by the total number of seventh-graders:

0.15 x 780 = 117

Therefore, we can estimate that about 117 seventh-graders are expected to attend summer camp.

Answer:i think -81

Step-by-step explanation:3x (-3) = -9.        -9x(-3)=27.       27x(-3)= -81

The required  derivative of [tex]f(x) = \frac{2x^3 - 1}{x}$[/tex] is [tex]$f'(x) = 4x + \frac{1}{x^2}$[/tex].

A technique for determining a function's derivative is differentiation. Mathematicians use a method called differentiation to determine a function's instantaneous rate of change based on one of its variables. The most typical illustration is velocity, which is the rate at which a distance changes in relation to time.

The function [tex]f(x) = \frac{2x^3 - 1}{x}$[/tex] can be written as [tex]f(x) = 2x^2 - \frac{1}{x}$[/tex].

The derivative of f(x) can be found using the power rule and the derivative of 1/x, which is[tex]-\frac{1}{x^2}$[/tex].

Therefore, we have:

[tex]$f'(x) = 4x + \frac{1}{x^2}$$[/tex]

So the derivative of [tex]f(x) = \frac{2x^3 - 1}{x}$[/tex] is [tex]$f'(x) = 4x + \frac{1}{x^2}$[/tex].

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Complete question:

Find the derivative of the following, using differentiation from first principles. f(x) = 2x²-1/x​.

Answer: $1,282.31 in the account after 8 years.

Step-by-step explanation:

To calculate the future value of the investment, we can use the formula for compound interest:

A = P * (1 + r/n)^(n*t)

where:

A = the future value of the investment

P = the principal amount (initial investment)

r = the annual interest rate (as a decimal)

n = the number of times the interest is compounded per year

t = the number of years

In this case, we have:

P = $1,000.00 (the initial deposit)

r = 3.44% = 0.0344 (the annual interest rate)

n = 12 (the number of times the interest is compounded per year, since it is compounded monthly)

t = 8 (the number of years)

So, plugging in the values:

A = $1,000.00 * (1 + 0.0344/12)^(12*8)

A = $1,000.00 * (1 + 0.0028666666666667)^96

A = $1,000.00 * 1.2823139327534472

A = $1,282.31 (rounded to the nearest cent)

Therefore, you will have approximately $1,282.31 in the account after 8 years.

The domain = {x ∈ R : x ≠ 2} and the range = {g ∈ R : g ≠ 5} In light οf this, g(x) has a h value οf 2 and a k value οf 5.

The difference between bοth the highest & lοwest values in statistics fοr a particular data cοllectiοn is called the range. Fοr instance, if the data set is 2, 5, 8, 10, 3, then the range is 10 - 2 = 8.

The definitiοn οf the functiοn g(x) is.

g(x) = 1/(x - 2) + 5

As the denοminatοr οf a fractiοn cannοt be zerο, the dοmain οf g(x) includes all real integers with the exceptiοn οf x = 2.

The range οf g(x) can be fοund by cοnsidering the behaviοr οf the functiοn as x apprοaches infinity οr negative infinity. As x apprοaches infinity οr negative infinity, the value οf g(x) apprοaches 5 (since the 1/(x - 2) term becοmes negligible cοmpared tο 5). Therefοre, the range οf g(x) is all real numbers except values very clοse tο 5.

It is pοssible tο rewrite the functiοn g(x) as fοllοws:

g(x) = (1/(x - 2)) + 5

This is in the fοrm:

g(x) = a/(x - h) + k

Where a = 1, h = 2, and k = 5.

Therefοre, the h value fοr g(x) is 2, and the k value fοr g(x) is 5.

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The area should the base of the new container must have option D that is, A = 2m-10.

In mathematics, area is a measurement of the size of a two-dimensional surface or shape, usually measured in square units such as square meters, square centimeters, or square feet. It is the amount of space inside the boundary of a flat object or shape.

Here,

To calculate the area of the base of the new container, we need to find the radius of the container first. Since the diameter is given as 10 cm, the radius would be half of that, which is 5 cm. The formula for the area of a circle is A = πr², where A is the area and r is the radius. So, substituting the values, we get:

A = π(5 cm)²

A = π(25 cm²)

A = 25π cm²

However, the answer choices are not in this format. To simplify the answer, we can use the value of π as approximately 3.14 (rounded to two decimal places). So, the area of the base would be:

A = 25π cm²

A ≈ 25(3.14) cm²

A ≈ 78.5 cm²

Now, we need to choose the answer option that represents this area in terms of variables. The only option that matches is:

d. A = 2m-10

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Complete question:

Question 6. One of the bases of a container for storing gasoline has broken and it is necessary to buy a new one. The diameter of the container is 10 cm. What area should the base of the new container have?

a. A = -10²

b. A = 2m-5

c. A = -5²

d. A = 2m-10

Answer:

A. To find the acceleration, we need to take the derivative of the velocity function with respect to time:

a(t) = v'(t) = 2(pi) - cos(t(pi))

B. To find the minimum acceleration, we need to find the critical points of the acceleration function in the interval [0, 3].

a'(t) = sin(t(pi))

The critical points occur when sin(t(pi)) = 0, which means t = 0, 1, 2, 3. We need to evaluate the acceleration function at these points and at the endpoints of the interval:

a(0) = 2(pi) - cos(0) = 2(pi)

a(1) = 2(pi) - cos(pi) = pi + 2

a(2) = 2(pi) - cos(2pi) = 2(pi)

a(3) = 2(pi) - cos(3pi) = pi - 2

The minimum acceleration occurs at t = 3, with a minimum value of pi - 2.

C. To find the maximum velocity, we need to find the critical points of the velocity function in the interval [0, 2].

v'(t) = 2(pi) - cos(t(pi)) = 0

The critical points occur when cos(t(pi)) = 2(pi). We can solve for t as follows:

cos(t(pi)) = 2(pi)

t(pi) = arccos(2(pi))

t = arccos(2(pi))/pi ≈ 1.58

We need to evaluate the velocity function at these points and at the endpoints of the interval:

v(0) = -sin(0) = 0

v(1.58) ≈ 1.69

v(2) = (2(pi) - 5)(2) - sin(2(pi)) = 4(pi) - 10

The maximum velocity occurs at t = 1.58, with a maximum value of approximately 1.69.

Answer:

You can use trigonometry to solve this problem. The distance from the base of the tree to where you are standing forms the adjacent side of a right triangle, with the height of the tree being the opposite side and the angle of elevation being 39°.

Using the tangent function: tan(θ) = opposite/adjacent

tan(39°) = 390 / adjacent

Adjacent = 390 / tan(39°)

Adjacent ≈ 496.4 feet

So you are approximately 496.4 feet away from the base of the tree.

Step-by-step explanation:

Step-by-step explanation:

that the answerrrrrrrrr

The nth term of the given sequence is 1/n².

An arithmetic progression (AP) is a sequence of numbers in which each term, starting from the second term, is obtained by adding a fixed constant value to the previous term. This constant value is called the common difference, and it remains the same throughout the sequence.

A geometric progression (GP) is a sequence of numbers in which each term, starting from the second term, is obtained by multiplying the previous term by a fixed constant value. This constant value is called the common ratio, and it remains the same throughout the sequence.

In the given question,

The given sequence is of the form:

1, 1/2², 1/3², 1/4², ...

So, the nth term can be written as:

1/n²

Therefore, the nth term of the given sequence is 1/n².

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Answer:

We know that the sum of the angles in a triangle is 180 degrees. Therefore, we can write:

m∠A + m∠B + m∠C = 180

Substitute the given values:

5x+6 + 7x-18 + m∠C = 180

Combine like terms:

12x-12 + m∠C = 180

Add 12 to both sides:

12x + m∠C = 192

Subtract 12x from both sides:

m∠C = 192 - 12x

Therefore, m∠C is equal to 192 minus 12 times x.

115° is the value of external angle.

Where is exterior angle?

Angles that are outside of a polygon but parallel to its inner angles are said to be its outside angles. The total of the two internal opposite angles is the measure of an outside angle. A triangle's one side is extended to form the triangle's exterior angle.

                        Exterior angles are those that exist between an extended side and the side that is immediately adjacent. A triangle's outer angles all have measurements that are equal to the sum of their two opposite sides. inner perspectives.

  AD ║EG

∠BFC= 75°

∠EFB = 40°

∠FCD =  ( 40+75)

          = 115°

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None of the trains had exactly 48 passengers, as none of the numbers in the stem leaf plot are equal to 48. The closest numbers are 45 and 49, but neither are exactly 48.

Passenger is an open source web application built on top of the popular Ruby on Rails web framework. It is designed to make it easy to deploy, manage, and monitor web applications in production. Passenger helps developers quickly deploy applications with minimal effort and maximum control. It can be used to control the entire process of deploying applications, from the initial code commit to the final running web server. Passenger simplifies and streamlines the process of deploying, configuring, and running web applications, allowing developers to focus on the application's features and features. Passenger also provides tools and features to help developers troubleshoot, monitor, and scale their applications.

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Answer:

The discount is $8.55, which is option C.

Step-by-step explanation:

To find the discount, we need to calculate 20% of the original price:

Discount = 20% x $42.75

Discount = $8.55

Therefore, the discount is $8.55, which is option C.

The simulation suggests that the chef's estimation of 30% broccoli soup orders is reasonable, but actual orders will vary from one set of customers to the next.

The chef's estimation of 30% broccoli soup orders seems reasonable based on the probabilities given, but the actual number of broccoli soup orders will likely vary from one set of 10 customers to the next. To estimate the accuracy of the chef's estimation, she conducts a simulation by shuffling cards representing the soup choices and randomly selecting one for each of the 10 customers. She repeats this process five times.

Based on the simulation results, we can see that the actual number of broccoli soup orders varies quite a bit from the expected value of 1.5. However, this is to be expected due to the random nature of the simulation.

To further estimate the accuracy of the chef's estimation, we could calculate the mean and standard deviation of the results to get a better sense of the distribution of possible outcomes.

Overall, the simulation suggests that the chef's estimation of 30% broccoli soup orders is a reasonable estimate, but the actual number of broccoli soup orders will likely vary from one set of 10 customers to the next.

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The total distance that the water tanker has covered in March of 2022 is given as follows:

1860 kilometers.

Velocity is given by the change in the distance divided by the change in the time, hence the following equation is built to model the relationship between these three variables:

v = d/t.

The parameters for this problem are given as follows:

Hence the total distance is then obtained as follows:

d = v x t

d = 60 x 31

d = 1860 kilometers.

The complete question is:

"Assuming that the water tanker travels an average of 60 kilometers a day, calculate the total distance that the water tanker has covered in March 2022​".

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