15√2 = x√2please help me, how do i solve this? i'm in 9th grade and i completely forgot how to do this.

The standard deviation of X to be approximately 0.4852. The correct answer is option (A).

To calculate the standard deviation of X, we need to first calculate the probability of drawing a red marble on the first draw, which is 11/29. The probability of not drawing a red marble on the first draw is 18/29. The probability of drawing a red marble on the second draw, given that we did not draw a red marble on the first draw, is 11/29. Using the formula for the geometric distribution, which models the number of trials until the first success, we can calculate the expected value of X, which is 1/p, where p is the probability of success (11/29 in this case).

Therefore, the expected value of X is 29/11. To calculate the standard deviation of X, we use the formula sqrt(q/p^2), where q is the probability of failure (18/29) and p is the probability of success (11/29). Plugging in these values, we get the standard deviation of X to be approximately 0.4852.  Therefore, the correct answer is option A, 0.4852.

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1. The radius of the cylinder is  7. 05 cm

2. The length of the cylinder is  15, 384 meters

3. The radius of the big cylinder is 5. 64 cm

The formula for the volume of a cylinder is expressed as;

V = πr²h

Such that;

1. We have that volume = 2500 cm³

Height = 16cm

Substitute the values, we have;

2500 = π × r² × 16

Divide both sides by 16

r² = 49. 76

Find the square root

r = 7. 05 cm

2. Volume = 20000 cm³/100 = 200 meters

Radius = diameter/2 = 13/2 = 6.5cm = 0. 065 m

Substitute the values

200/0. 013 = h

Divide the values

h = 15, 384 meters

3. Volume = πr²h

Volume = 3.14 × 3.5² × 13

Volume = 500. 045 cm²

Then, substitute the values

500. 045 = 3.14 × r² × 5

r² = 31. 85

find the square root

r = 5. 64 cm

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In Option 1, the arrival rate remains constant at 13 customers per hour. This means that, on average, 13 customers arrive at the checkout lane every hour, following a Poisson probability distribution.

However, the service rate in Option 1 increases to 30 customers per hour. This improvement is achieved by hiring a second person to assist the cashier in bagging groceries while the main cashier is occupied with entering cost data and collecting money from the customer. This essentially speeds up the overall service process, allowing more customers to be served within the same time frame.

The service rate of 30 customers per hour indicates that, on average, the cashier and the assistant can complete the checkout process for 30 customers in an hour. The service times still follow an exponential probability distribution, but with a faster rate of service compared to the initial service rate of 20 customers per hour.

By implementing Option 1, the manager aims to reduce the waiting time prior to the checkout process to no more than five minutes, thereby improving overall customer satisfaction and efficiency at Pete's Market.

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The perimeter of the triangle is 6 + 4√13

Let's denote the length of the congruent sides of the isosceles triangle as x.

The formula for the area of a triangle is A = (1/2)bh, where b is the base and h is the height.

So, we have

A = (1/2)bh

12 = (1/2)(6)(h)

h = 4

Now, using the Pythagorean theorem, we can solve for the length of the congruent sides:

x^2 = 6^2 + 4^2

x^2 = 52

x = √52

The perimeter of the triangle is the sum of the lengths of its sides:

P = 6 + √52 + √52

P = 6 + 2√52

So, we have

P = 6 + 4√13

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The correct proportion used is (1.5/6) = (RS/8)

To find the length of side RS in triangle RST, given that triangle MON is similar to triangle RST, we can set up a proportion using the corresponding sides of the similar triangles. The given side lengths are:

Triangle MON: MN = 6 ft, MO = 1.5 ft
Triangle RST: ST = 8 ft

Since the triangles are similar, we have the proportion:

(MO/MN) = (RS/ST)

Substituting the given values, we get:

(1.5/6) = (RS/8)

Now, we can solve for RS:

1. Cross-multiply: 1.5 * 8 = 6 * RS
2. Simplify: 12 = 6 * RS
3. Divide by 6: RS = 2

So, the length of side RS in feet is 2. The correct proportion used is:

(1.5/6) = (RS/8)

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After evaluating the integral ∫√(x-x²)dx, we get:

∫√u (1 - 2x) du, with the limits of integration 0 to 1/4

To evaluate the integral ∫√(x-x²)dx using the indicated table of integrals, you should look for an entry in the table that matches the given integral's form. Unfortunately, I do not have access to the specific table you are referring to. However, I can guide you on how to approach this problem.

First, you should make a substitution:

let u = x - x², then du = (1 - 2x)dx. To proceed with this substitution, you'll need to rewrite the integral in terms of 'u' and 'du'. Notice that when x = 1/2, u = 1/4.

Therefore, you can change the limits of integration as well: x = 0 corresponds to u = 0, and x = 1 corresponds to u = 0.

Now,
∫√(x-x²)dx = (1/2) ∫(1-4x+4x²-3)⁽¹/²⁾ dx

Now, we can look up the integral in the table of integrals, which indicates that:

∫(1-4x+4x²-3)⁽¹/²⁾ dx = (1/2) [ (x-1)√(1-4x+4x²) + 2arcsin(2x-1) ] + C

Therefore, substituting this result back into the original integral, we get:

∫√(x-x²)dx = (1/2) [ (x-1)√(1-4x+4x²) + 2arcsin(2x-1) ] + C

where C is the constant of integration.

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Step-by-step explanation:

use Pythagorean theorem to find the height

c = 38 ft

a = 14 ft

a² + b² = c²

(14)² + b² = (38)²

b² = 1444 - 196

b² = 1248

b = √1248

b = √16 × 78

b = 4√78 feet

Kearney's retirement savings when he retired at age 68, assuming monthly compounding of interest, was $429,336.69.

To calculate Kearney's retirement savings at age 68, we need to use the formula for the future value of an annuity due, which is:

FV = PMT x [((1 + r/n[tex])^(n*t)[/tex] - 1) / (r/n)] x (1 + r/n)

Where:

Plugging in the numbers, we get:

FV = 200 x [((1 + 0.055/12[tex])^(12*38)[/tex] - 1) / (0.055/12)] x (1 + 0.055/12)

FV = $429,336.69

Therefore, Kearney's retirement savings at age 68 would be approximately $429,336.69, assuming he invested $200 per month in securities with an average annual return of 5.5% and monthly compounding of interest. It's important to note that this calculation assumes that Kearney did not withdraw any money from his retirement savings during the 38-year period. Additionally, the actual value of his retirement savings could be different based on fluctuations in the market and any fees or taxes associated with his investments.

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The prices of the four movies that Sally has already seen will not change after she sees the next movie.

The ticket prices of the four movies that Sally has already seen are fixed and do not depend on whether she sees another movie or not. Therefore, these prices will remain the same even after she sees the next movie. The price of the next movie that Sally plans to see is $34, which is independent of the ticket prices of the previous movies.

Thus, the cost of the previous movies that Sally has seen will not change after she sees the next movie. In other words, the previous expenses are sunk costs and are irrelevant to future decisions.

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The best estimate for the elk population is b) 1,250.

To estimate the elk population, you can use the mark and recapture method. The proportion of marked elk to the total marked population should be equal to the proportion of marked elk observed in the sample to the total observed population.

So, (marked elk / total marked population) = (marked elk observed / total observed population)

In this case: (75 / total population) = (15 / 250)

Now, solve for the total population:

75 / total population = 15 / 250

Cross-multiply:

15 * total population = 75 * 250

total population = (75 * 250) / 15

total population = 18,750 / 15

total population = 1,250

The best estimate for the elk population is 1,250 (option b).

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The binomial conditions are not met as the cards are not being replaced, so the independence condition is not met. So, the correct answer is D).

The conditions for a binomial setting are

there are a fixed number of trials,

the trials are independent,

there are only two possible outcomes (success or failure),

the probability of success is constant for each trial.

In this scenario, the first two conditions are met as Lan is turning over the first four cards and they are independent events. The third condition is also met as the success is defined as observing an ace and the failure is observing any other card.

However, the fourth condition is not met as the probability of success changes for each trial. After the first card is turned over, the probability of observing an ace changes for the second trial. Therefore, the scenario does not meet all the conditions for a binomial setting. So, the correct option is D).

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Answer:

  (c)  The third arc should cross the second arc.

Step-by-step explanation:

You want to know the correction required to the construction of a copy of an angle.

To copy an angle to a new vertex, arcs are drawn with the same radius at the original vertex (first arc) and the new vertex (second arc).

Then the compass is set to the length JK, and a third arc is drawn with L as the center, marking off the distance JK on the second arc.

In order do that, the third arc should cross the second arc.

__

Additional comment

This allows you to create ∆DLM congruent to ∆BKJ. Hence angle D will be congruent to angle B.

It helps to actually do these constructions on paper using compass and straightedge. That gives you better intuition about how they work, and about geometric relations in general.

Answer:

Step-by-step explanation:

The distance from point A to point B is approximately 13706.2 feet. Rounded to the nearest tenth of a foot, this is 164474.4 inches or 13706.2 / 12 ≈ 1142.2 feet.

Let's first draw a diagram to visualize the situation:

           Lighthouse

                |

                |  x

                |

                |

          A ------------ B

                y

In the diagram, A is the starting point of the boat, B is the point where the crew measures the angle of elevation to be 6 degrees, and Lighthouse is the location of the lighthouse. We are looking for the distance AB.

From point A, we can use the tangent of the angle of elevation to find the height of the lighthouse beacon above sea level:

tan(15°) = height / 1433 feet

height = 1433 feet * tan(15°) ≈ 383.6 feet

Similarly, from point B, we can find the height of the lighthouse beacon above sea level:

tan(6°) = height / (1433 feet + AB)

height = (1433 feet + AB) * tan(6°)

Now we can set these two expressions for height equal to each other, since they represent the same height:

1433 feet * tan(15°) = (1433 feet + AB) * tan(6°)

Multiplying both sides by the denominator of the right-hand side, we get:

1433 feet * tan(15°) = 1433 feet * tan(6°) + AB * tan(6°)

Subtracting 1433 feet * tan(6°) from both sides, we get:

AB * tan(6°) = 1433 feet * (tan(15°) - tan(6°))

Dividing both sides by tan(6°), we get:

AB = 1433 feet * (tan(15°) - tan(6°)) / tan(6°) ≈ 13706.2 feet

Therefore, the distance from point A to point B when rounded to the nearest tenth of a foot, this is 164474.4 inches or 13706.2 / 12 ≈ 1142.2 feet.

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Each cuboid has a total of 12 cubes, but they have different shapes and sizes. The table is attached below.

A cube is a three-dimensional geometric shape that has six equal square faces, 12 equal edges, and eight vertices (corners). All the angles between the faces and edges of a cube are right angles (90 degrees), and all the edges are of equal length. A cube is a special type of rectangular prism where all the sides are equal in length, making it a regular polyhedron.

Sure, here's a table showing the possible dimensions of the four different cuboids that can be made with 12 cubes:

Cuboid Length Width Height

A                1       2 6

B                1       3 4

C                2       2 3

D                1        1 12

Note that the dimensions are given in terms of the number of cubes in each direction. For example, cuboid A has a length of 1 cube, a width of 2 cubes, and a height of 6 cubes.

Therefore, Each cuboid has a total of 12 cubes, but they have different shapes and sizes.

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product rule, chain rule, and sum rule are utilized to assess a subordinate of y = sin(x)cos(x), a subsidiary of y = sin(cos(x)), a subordinate of y = sin(-x), a subsidiary of y = sin(x) + cos(x).

a) subordinate of y = sin(x)cos(x) can be assessed by utilizing the product rule.

[tex]y' = (cos(x))(cos(x)) + (sin(x))(-sin(x)) = cos^2(x) - sin^2(x)[/tex]

b) chain rule is used  to find the derivative of y = sin(cos(x)):

y' = (cos(x))(cos(cos(x)))

c) chain rule is used  to find the derivative of y = sin(-x):

y' = -cos(-x) = -cos(x)

d) derivative of y = sin(x) + cos(x)  can be evaluated by using sum rule

y' = cos(x) - sin(x)

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The type of fee that will be charged depends on the specific service provided by the broker to the client. Non-transaction fees are typically charged for account maintenance or access to investment tools, while transaction fees are charged for specific trades or transactions.

To determine the type of fee that will be charged in each situation, we need to consider the specific services that were provided by the broker to the client.

For Joanne, her brokerage firm charged her a fee for providing investment information to help her make informed choices. This type of fee is a non-transaction fee, as it is not related to a specific transaction or trade.

Pete, who hasn't bought or sold any stock this year, was charged an inactivity fee of $75 for the year by his broker. This fee is also a non-transaction fee, as it is not related to a specific trade but rather to the inactivity of the account.

John's broker provided him with stock trading software to manage his trading. This type of service is typically included in a brokerage firm's platform fee, which is a non-transaction fee that covers the cost of maintaining the software and other tools that clients can use to manage their investments.

Lisa sold 50 shares of stock A on a given day and her broker charged her $12 for this trade. This type of fee is a transaction fee, which is charged for each specific trade or transaction that a client makes.

Finally, Reggie's broker charged him a front-end load of 2.75% when he purchased a fund. This fee is a type of sales charge or commission that is applied to the initial investment and is considered a transaction fee.

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80 shoppers in the dairy section at random is a biased sample (d).

To estimate the number of people who buy milk in a grocery store, we need an unbiased sample that represents the entire population. The options provided are 70 shoppers at random as they leave the store, 8 shoppers as they enter the store, 60 women with children at random, and 80 shoppers in the dairy section at random.

The most unbiased sample is selecting 80 shoppers in the dairy section at random because the dairy section is where people are most likely to buy milk, and selecting a random sample of shoppers in that section ensures that we are not introducing any biases.

The other options may introduce biases since they are not necessarily representative of the entire population of shoppers in the store. Therefore, selecting 80 shoppers in the dairy section at random provides the most unbiased estimate of the number of people who buy milk in the grocery store. So d is correct option.

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A Pentagon on a coordinate plane would be neither a relation nor a function.

This is because it does not have a unique output for every input, which is a requirement for a function. This is because a function must have a unique output for each input, while a pentagon may have multiple points (outputs) for a given x-coordinate (input) due to its shape. Additionally, it does not satisfy the vertical line test, which is a requirement for a relation. Therefore, it is not a relation or a function.

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A bag contains five red socks and eight blue socks. Lucky reaches into the bag and randomly selects two socks without replacement, the probability that Lucky will get different colored socks is 10/39.

We can divide the issue into two distinct possibilities and multiply them together to find a solution.

Let's start by thinking about the likelihood of choosing a red sock during the initial draw.

The likelihood of choosing a red sock on the first draw is 5/13 due to the fact that there are only five red socks among the total of thirteen socks (five red plus eight blue).

There are now twelve socks left in the bag after the first one is drawn, with four red and eight blue.

On the second draw, there is an 8/12 chance of choosing a blue sock, which is a different colour.

We add the probabilities together to determine the likelihood that both events (drawing a red sock first and a blue sock second) will occur:

(5/13) * (8/12) = 40/156 = 10/39

Therefore, the probability that Lucky will get different colored socks is 10/39.

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The equation D = 2zv when solved for v is D/2z = v

To solve D = 2zv for v, we need to isolate the variable v on one side of the equation. We can do this by dividing both sides of the equation by 2z:

D = 2zv

So, we have

D/2z = v

So the solution for v is v = D/2z.

This equation tells us that v is equal to the ratio of D divided by 2z. In other words, v is proportional to D, and inversely proportional to 2z.

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The domain and range that represents this situation is: B Domain All real numbers greater than or equal to 0; Range: All real numbers greater than or equal to 46.

In the given situation, the number of giraffes in the San Antonio Zoo is represented by the function y = 46(1.08)ˣ To determine the domain and range that represent this situation, we must consider the context and the variables involved.

The domain represents the possible values of x, which corresponds to the number of years. Since time cannot be negative in this context, the domain includes all real numbers greater than or equal to 0.

The range represents the possible values of y, which corresponds to the number of giraffes. The initial number of giraffes is 46, and the population is increasing each year. Therefore, the range includes all real numbers greater than or equal to 46.

Based on this information, the correct answer is B: Domain: All real numbers greater than or equal to 0; Range: All real numbers greater than or equal to 46.

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Complete question:

There are 46 giraffes in the San Antonio Zoo. The population increases at a rate of 8% each year. The function y = 46(1.08)* can be used to determine y, the number of giraffes

at the zoo after x years. What is the domain and range that represents this situation?

A Domain: All real numbers less than or equal to 46

Range: All real numbers

B Domain: All real numbers greater than or equal to 0

Range: All real numbers greater than or equal to 46

C Domain: All real numbers greater than or equal to 1.08

Range: All real numbers greater than 0

D Domain: All real numbers

Range: All real numbers greater than or equal to 0

The velocity of the velociraptor is 0.4 m/s [E] - 0.8 m/s [W] + 0.3 m/s [S] and  the speed of the velociraptor is 2 m/s.

To calculate the speed of the velociraptor, we need to divide the total distance traveled by the total time taken:

Total distance = 5m + 10m + 3m + 2m = 20m

Total time = 10 seconds

Speed = Total distance / Total time

     = 20m / 10s

     = 2m/s

To calculate the velocity of the velociraptor, we need to consider both the magnitude of its speed and its direction. We can calculate the displacement by subtracting the final position from the initial position:

Displacement = (5m [E] + 10m [W] + 3m [S] + 2m [W])

           = (5m [E] - 8m [W] + 3m [S])

           = 5m [E] - 8m [W] + 3m [S]

Note that we have used negative sign for the distance traveled towards the west.

The time taken is 10 seconds.

Velocity = Displacement / Time taken

        = (5m [E] - 8m [W] + 3m [S]) / 10s

        = 0.4 m/s [E] - 0.8 m/s [W] + 0.3 m/s [S]

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The measure of each arc in the circle is given by: 360 degrees / n

where n= number of spokes

If the spokes on a bicycle wheel divide the wheel into congruent sections, then each section is an equal angle at the center of the circle. Since there are "n" spokes on the wheel, the circle will be divided into "n" congruent sections.

Therefore, the measure of each arc in the circle is given by:

= 360 degrees / n

For example, if there are 18 spokes on the wheel, then each arc will have a measure of:

360 degrees / 18 = 20 degrees

So each arc would measure 20 degrees.

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Answer:

Step-by-step explanation:

you multiply 5 by 50 and that would equal 250

5 x 50 = 250

We define [tex]9^{\frac{1}{2} }[/tex] to be the square root of nine. This means that [tex](9^{\frac{1}{2} })^{2}[/tex] must be equal to nine.

By using the properties of exponents to explain why [tex]8^{\frac{1}{3} }=2[/tex];

Statement                           Reasons_____________________

[tex]8^{\frac{1}{3} }=2[/tex]                                  Given

[tex](8^{\frac{1}{3} })^3=2^3[/tex]                        Exponent property of equality.

[tex]8^{\frac{1}{3} \times 3}=2^3[/tex]                        Exponent property of a power.

8 = 8                                simplify

In Mathematics, an exponent refers to a mathematical operation that is typically used in conjunction with an algebraic expression in order to raise a quantity to the power of another.

This ultimately implies that, an exponent is represented by the following mathematical expression;

bⁿ

Where:

the variables b and n are numerical values (numbers) or an algebraic expression.

n is referred to as a superscript or power.

By applying the multiplication and division law of exponents for powers to each of the expressions, we have the following:

[tex]9^{\frac{1}{2} }[/tex] = √9 (square root of nine)

[tex](9^{\frac{1}{2} })^{2}=(9^{\frac{1}{2} \times 2})=9^1 = 9[/tex]  

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Answer: So the second model is 0.2667 feet longer than the first.

Step-by-step explanation: 8 inches * (1/12 feet per inch) * (1/2.5) = 0.1333 feet

So the length of the first model is 0.1333 feet.

The length of the second model is also at a scale of 1/2.5 feet, so its length can be found directly by multiplying the length of the actual building by the scale factor:

Length of second model = 1/2.5 * 1 foot = 0.4 feet

to make next step we can use difference between these numbers by their lengths: Length of second model - Length of first model = 0.4 feet - 0.1333 feet = 0.2667 feet

Yes, The given table is an example of a linear function.

Since, The equation of line in point-slope form passing through the points

(x₁ , y₁) and (x₂, y₂) with slope m is defined as;

⇒ y - y₁ = m (x - x₁)

Where, m = (y₂ - y₁) / (x₂ - x₁)

We have to given that;

To check the following data an example of a linear function.

Now, We can check the slope of given tables as;

⇒ Slope = (3 - (- 2)) / (0 - (- 7))

             = (5 / 7)

⇒ Slope = (8 - 3) / (7 - 0)

             = (5 / 7)

Thus, This table represent the an example of a linear function.

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The percentage of beds that should be specially equipped is 19.0%. The correct option is c.

To be "pretty sure" of having enough specially equipped beds, the hospital wants to have only a 5% chance of running short of these beds, even when the hospital is fully occupied. This means that the probability of having enough beds should be 95%.

Let x be the percentage of beds that should be specially equipped. Then the probability that a patient does not require a specially equipped bed is 100% - 13.95% = 86.05%.

The probability that all 258 beds are occupied by patients who do not require a specially equipped bed is (0.8605)^258 = 0.0501, which is about 5%.

Therefore, the probability that at least one patient requires a specially equipped bed is 1 - 0.0501 = 0.9499, which is about 95%.

We can set up an equation to solve for x:

0.9499 = 1 - (1 - x)^258

Solving for x, we get:

x = 19.0%

Therefore, the percentage of beds that should be specially equipped is 19.0%.

So the answer is C) 19.0%.

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To find the volume and surface area of the composite figure, we need to first find the individual volumes and surface and the right cone, and then add them together.

The volume of a hemisphere with radius r is (2/3)πr^3, and the surface area is 2πr^2.

The volume of a right cone with radius r, height h, and slant s is (1/3)πr^2h, and the surface area is πr^2 + πrs.

In this case, the radius r and slant s are both 6 cm, and the height h of the cone can be found using the Pythagorean theorem: h = √(s^2 - r^2) = √(8^2 - 6^2) = √28 ≈ 5.29 cm.

So, the volume of the hemisphere is (2/3)π(6 cm)^3 = 72π/3 = 24π cubic cm, and the surface area is 2π(6 cm)^2 = 72π square cm.

The volume of the right cone is (1/3)π(6 cm)^2(5.29 cm) = 62.83π/3 ≈ 20.94π cubic cm, and the surface area is π(6 cm)^2 + π(6 cm)(8 cm) = 36π + 48π = 84π square cm.

Therefore, the total volume of the composite figure is 24π + 20.94π = 44.94π cubic cm, and the total surface area is 72π + 84π = 156π square cm.

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