Select the correct number from each drop-down menu to complete the equation. ​ 7/8 − ( − 2 + 3/ 4 ) = 8 7 ​ −( − 2+ 4 3 ​ )= ( + ) +7/8

The force acting on the object is 25 N when the acceleration of the object becomes 5 m/s².

According to the problem, the force (F) varies directly with the object's acceleration (a), which can be expressed as F = k × a, where k is the proportionality constant. To find the value of k, we can use the given information that when F = 15 N, a = 3 m/s²:

15 N = k × 3 m/s²

k = 5 Ns²/m

Now, we can use the value of k to find the force (F) when the acceleration (a) becomes 5 m/s²:

F = k × a

F = 5 Ns²/m × 5 m/s²

F = 25 N

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Answer:

C. 40

Step-by-step explanation:

36/(5x+13)=30/(6x-2)

Cross multiply

36·(6x-2)=30·(5x+13)

216x-72=150x+390

216x-150x=390+72

66x=462

x=7

Substituting 7 in for x,

6(7)-2

42-2

40

The Area of the triangle with vertices A(0, 0, 0), B(5, 0, 7), and C(-5, 2, 0) is sqrt(74) square units.

To find the area of the triangle with the given vertices, we can use the cross product of two vectors formed by subtracting one vertex from the other two vertices. The magnitude of the cross product of two vectors is equal to the area of the parallelogram formed by the vectors, and half of that is the area of the triangle.

Let vector AB be formed by subtracting point A(0, 0, 0) from point B(5, 0, 7):

AB = B - A = (5, 0, 7) - (0, 0, 0) = (5, 0, 7)

Let vector AC be formed by subtracting point A(0, 0, 0) from point C(-5, 2, 0):

AC = C - A = (-5, 2, 0) - (0, 0, 0) = (-5, 2, 0)

The cross product of AB and AC is:

AB x AC = (0i - 14j - 10k)

The magnitude of AB x AC is:

|AB x AC| = sqrt(0^2 + (-14)^2 + (-10)^2) = sqrt(296) = 2*sqrt(74)

Therefore, the area of triangle ABC is:

A = (1/2) |AB x AC| = (1/2) * 2 * sqrt(74) = sqrt(74)

Hence, the area of the triangle with vertices A(0, 0, 0), B(5, 0, 7), and C(-5, 2, 0) is sqrt(74) square units.

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If the current stock price of Purcell Industries is $15 and the strike price of the option is also $15, the option is considered to be at the money (ATM). Therefore, the value of the option will depend on various factors such as the time to expiration, volatility, and interest rates.

When the strike price of an option is equal to the current market price of the underlying stock, it is said to be at the money. In the case of Purcell Industries, since the current stock price is $15 and the strike price of the option is also $15, the option is at the money. An ATM option has no intrinsic value because the option does not have any profit or loss in the underlying asset.

The value of an ATM option is based solely on its time value, which is the amount of time remaining until the option's expiration date. The time value of an option can be influenced by various factors, including the volatility of the underlying asset, interest rates, and other market conditions. For example, an increase in volatility would increase the time value of an option because there is a greater chance that the stock price could move in a favorable direction for the option holder. Similarly, an increase in interest rates would increase the time value of a call option but decrease the time value of a put option.

Overall, an ATM option has no intrinsic value, and its value is based on various market factors. Therefore, it is important to consider these factors when deciding whether to buy or sell an ATM option.

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The relation that describes a function is graph in option B because each of the input values has only one output

In mathematics  a function is a relation between a set of inputs (called the domain) and a set of outputs (called the range)  where each input is associated with exactly one output.

It is a rule or mapping that assigns a unique output value to each input value.

In the graph, only option B typically shows aa unique output value for all the input values. hence this is the function

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The required number of revolution for small gear is 2

The given figure is a  circle,

Then,

Radius of big circle = 7

radius of small circle = 3

Since we know that perimeter of circle = 2πr

Therefore,

Perimeter of big circle = 2x7x(22/7)

                                     =  44 square units

Perimeter of small circle = 2x3x(22/7)

                                     =  18.84 square units

Now the umber of revolution for small gear to complete a single revolution of the larger gear = 44/18.84 = 2.33 ≈ 2

Hence, number of revolution = 2.

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To find the equation of the parabola, we need to determine its focus and directrix. Since the axis of symmetry is parallel to the y-axis, the equation of the parabola takes the form x=a(y-k)^2+h, where (h,k) is the vertex. The equation of the parabola: y = \frac{1}{25}(x-25)^2 + 18

We know the vertex is at (25,18)$, so we have h=25 and k=18. We also know the parabola passes through the point (0,43). Plugging these values into the equation gives:

0=a(43-18)^2+25

Simplifying and solving for a:

a=\frac{-25}{25^2-43^2}=\frac{-25}{-684}=\frac{25}{684}

Thus, the equation of the parabola is:

x=\frac{25}{684}(y-18)^2+25

or

\boxed{x=\frac{25}{684}y^2-\frac{25\cdot36}{684}y+25}

where the vertex is at (25,18) and the axis of symmetry is parallel to the y-axis.

Given that the parabola has its vertex at (25,18) and its axis of symmetry is parallel to the y-axis, we can use the vertex form of a parabola equation:

y = a(x-h)^2 + k

where (h,k) is the vertex of the parabola, and 'a' is a constant that determines the shape of the parabola.

Substitute the given vertex coordinates (25,18) into the equation:

y = a(x-25)^2 + 18

We are also given that the parabola passes through the point (0,43). Substitute this point into the equation to find the value of 'a':

43 = a(0-25)^2 + 18

Solve for 'a':

43 = a(625) + 18
25 = 625a
a = \frac{1}{25}

Now that we have found the value of 'a', we can write the equation of the parabola:

y = \frac{1}{25}(x-25)^2 + 18

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In architecture, how can understanding angle pairs help in designing and constructing buildings with stability and strength?

In surveying and navigation, how can angle pairs be used to calculate distances between two points or to determine the direction of a particular location?

Angle pairs refer to two or more angles that are related to each other in some way.

Here are two real-world questions about angle pairs:

In architecture, how can understanding angle pairs help in designing and constructing buildings with stability and strength?

In surveying and navigation, how can angle pairs be used to calculate distances between two points or to determine the direction of a particular location?

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The probability that the light bulb will last for more than 3000 hours is approximately 0.6065 or 60.65%.

We have,

To calculate the probability that a light bulb will last for more than 3000 hours, we need to use the exponential distribution, which is appropriate for modeling the lifetime of a light bulb.

The exponential distribution is defined by the formula:

[tex]P(X > x) = e^{-x/\mu}[/tex]

Where P(X > x) is the probability that the bulb will last more than x hours, e is the base of the natural logarithm (approximately 2.71828), x is the specific value (3000 hours in this case), and µ is the average lifetime of the light bulb (6000 hours in this case).

Plugging in the values:

[tex]P(X > 3000) = e^{-3000/6000}[/tex]

Calculating this expression:

P(X > 3000) ≈ 0.6065

Therefore,

The probability that the light bulb will last for more than 3000 hours is approximately 0.6065 or 60.65%.

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Answer:

Step-by-step explanation:

The answer is D

Thus,  the area of infinite region in the first quadrant between the curve y=e^-x and the x-axis is 1 square unit.

To find the area of the infinite region in the first quadrant between the curve y=e^-x and the x-axis, we need to integrate the function y=e^-x from x=0 to x=∞.

First, let's find the indefinite integral of e^-x:
∫e^-x dx = -e^-x + C

Next, we can use this indefinite integral to find the definite integral from x=0 to x=∞:
∫[0,∞]e^-x dx = lim┬(t→∞)∫[0,t]e^-x dx
= lim┬(t→∞)[-e^-t + e^0]
= lim┬(t→∞)[-e^-t + 1]
= 1

Therefore, the area of the infinite region in the first quadrant between the curve y=e^-x and the x-axis is 1 square unit.

It is important to note that this region is infinite because the curve y=e^-x approaches the x-axis but never actually touches it.

As we integrate from x=0 to x=∞, we are essentially adding up an infinite number of infinitely small rectangles, resulting in an infinitely large area.

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The profit function -400·p² + 12,400·p - 50,000, is a quadratic function and the maximum profit is $46,100

A quadratic function is a function that can be expressed in the form f(x) = a·x² + b·x + c, where a ≠ 0 and, a, b, and c are numbers.

The specified function is; P = -400·p² + 12,400·p - 50,000

The possible function in the question, obtained from a similar online question is the profit function

The possible requirement is to find the maximum profit of the company

The profit function, P = -400·p² + 12,400·p - 50,000 is a quadratic function, therefore;

The input value for the maximum value of the function, f(x) = a·x² + b·x + c, is the point x = -b/(2·a)

The price, p value when the profit function value reaches the maximum point is therefore;

p = -12,400/(2 × (-400)) = 15.5

The maximum profit is therefore;

P = -400 × 15.5² + 12,400 × 15.5 - 50,000 = 46,100

The maximum profit is $46,100

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The probability that a randomly selected value is greater than 2148.5 is approximately 0.0087, or 0.87% (accurate to 4 decimal places).

To find the probability that a randomly selected value is greater than 2148.5, we need to calculate the z-score first and then use a standard normal distribution table (or calculator) to find the probability.

1. Calculate the z-score:
[tex]z = (X - μ) / σ[/tex]
z = (2148.5 - 2098) / 21.2
z = 50.5 / 21.2
z ≈ 2.38 (rounded to the nearest hundredth)

2. Use a standard normal distribution table (or calculator) to find the area to the left of z = 2.38. In this case, the area to the left is approximately 0.9913.

3. Since we want the probability that a value is greater than 2148.5, we need to find the area to the right of z = 2.38. To do this, subtract the area to the left from 1:
P(X > 2148.5) = 1 - 0.9913 = 0.0087

So, the probability that a randomly selected value is greater than 2148.5 is approximately 0.0087, or 0.87% (accurate to 4 decimal places).

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Probability Distributions for Discrete Random Variables are

a. P(X = 3) = 0.2

b. P(X < 3) = 0.3

c. P(2 < X < 5) = 0.5

To solve the given problems, we need to determine the missing probability value for X = 3. Let's calculate it and then proceed with the rest of the questions.

Given:

X 1 2 3 4 5

P(x) 0.1 0.2 ? 0.3 0.2

To find the missing probability value:

0.1 + 0.2 + P(X = 3) + 0.3 + 0.2 = 1

0.8 + P(X = 3) = 1

P(X = 3) = 1 - 0.8

P(X = 3) = 0.2

Now, we can answer the questions:

a. P(X = 3) = 0.2

b. P(X < 3) = P(X = 1) + P(X = 2)

= 0.1 + 0.2

= 0.3

c. P(2 < X < 5) = P(X = 3) + P(X = 4)

= 0.2 + 0.3

= 0.5

Therefore,  Probability Distributions for Discrete Random Variables are

a. P(X = 3) = 0.2

b. P(X < 3) = 0.3

c. P(2 < X < 5) = 0.5

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Option d) Aluminum has no endurance limit of 100 KPI is not a valid statement.

2024 T4 aluminum does have an endurance limit which is defined as the stress level below which the material can withstand an infinite number of cycles without failure.

Now the value of the endurance limit depends on various factors such as the material's processing heat treatment, and surface finish, as well as the type of loading and environmental conditions.

In general, the endurance limit of 2024 T4 aluminum ranges from 45 to 85 percent of its ultimate tensile strength (UTS). The UTS of 2024 T4 aluminum is typically around 65-75 kpsi (kilo pounds per square inch).

Using the given options, we can estimate the endurance limit of 2024 T4 aluminum as:

a) Aluminum has an endurance limit of 115 KPI:

This option suggests that the endurance limit of 2024 T4 aluminum is higher than its UTS, which is not possible. Therefore, this option is not valid.

b) Aluminum has an endurance limit of 105 KPI:

Assuming this option to be true, the endurance limit of 2024 T4 aluminum is around 68 kpsi (i.e., 105/1.55). This value is within the typical range of endurance limit for this material.

c) Aluminum has an endurance limit of 95 KPI:

Assuming this option to be true, the endurance limit of 2024 T4 aluminum is around 61 kpsi (i.e., 95/1.55). This value is also within the typical range of endurance limit for this material.

Therefore, based on the given options, it is reasonable to estimate the endurance limit of 2024 T4 aluminum to be around 68-61 kpsi (or 105-95 KPI).

So, Aluminum has no endurance limit of 100 KPI is not a valid statement.

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False. Surveying 100% of a population is not always necessary and can be costly.

Instead, companies can use sampling techniques to survey a representative subset of the population, which can be more cost-effective and still provide accurate results. The key is to ensure that the sample is representative of the larger population to avoid biased results. Statistical methods such as margin of error and confidence intervals can be used to estimate the accuracy of the survey results based on the sample size and level of representativeness.

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The equation that can be used to find the length of the hypotenuse of a right triangle is the Pythagorean theorem, which states that the sum of the squares of the lengths of the legs of a right triangle is equal to the square of the length of the hypotenuse.

In the given triangle with side lengths 63, 16, and x, the length of the hypotenuse is represented by x. Thus, we can apply the Pythagorean theorem to find the value of x.

Using the Pythagorean theorem, we get:

x^2 = 63^2 + 16^2

Simplifying the equation, we get:

x^2 = 3969 + 256

x^2 = 4225

Taking the square root of both sides, we get:

x = 65

Therefore, the length of the hypotenuse of the right triangle is 65.

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if angle c=(2x+3) and angle d= (2x+1) Then, we can only say that: 4x + angle e = 176.

We know that the sum of angles in a triangle is always 180 degrees. Therefore, we can write an equation based on the given information:

angle c + angle d + angle e = 180

Substituting the given expressions for angles c and d, we get:

(2x + 3) + (2x + 1) + angle e = 180

Simplifying and combining like terms, we get:

4x + 4 + angle e = 180

Subtracting 4 from both sides, we get:

4x + angle e = 176

We do not have enough information to solve for x or angle e, as we do not know the value of angle e.

Therefore, we can only say that:

4x + angle e = 176.

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Considering the definition of zeros of a function, the time the ball remains in the air is 1.5 seconds.

The points where a polynomial function crosses the axis of the independent term (x) represent the zeros of the function.

Then, the zeros of a function are those values ​​of x for which the expression is equal to 0, and they correspond to the abscissa of the points where the parabola intersects the x-axis.

Considering the function h= -16t² +36, to calculate the time that the ball remains in the air, I must consider when the height is zero. That is, I must calculate the zeros of the function:

-16t² +36= 0

Solving:

-16t² = -36

t² = (-36)÷ (-16)

t²= 2.25

t=√2.25

t= ±1.5

Since time cannot be negative, the time the ball remains in the air is 1.5 seconds.

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The probability that a randomly selected examinee will complete the exam on time is 0.891 or 89.1%, assuming that the time taken per question follows a normal distribution with a mean of and a standard deviation

To solve this problem, we can use the normal distribution since the time spent per question follows a normal distribution with a mean of and a standard deviation of. We can then find the probability that a randomly selected examinee will complete the exam on time, which is defined as completing the exam within minutes.

Let X be the total time taken by an examinee to complete the exam, then X follows a normal distribution with mean and standard deviation.

The probability that an examinee completes the exam within the given time is equivalent to the probability that the total time taken by the examinee is less than or equal to minutes. We can then find this probability using the standard normal distribution, which is a normal distribution with a mean of 0 and a standard deviation of 1.

To do this, we first standardize the variable X as follows:

Z = (X - µ) / σ

where µ is mean and σ is the standard deviation. Substituting the values, we get:

Z = (180 - x ) /

We can then find the probability that an examinee completes the exam on time by finding the area under the standard normal distribution curve to the left of Z. This can be done using a table of the standard normal distribution or by using a statistical software package such as Excel.

Assuming a normal distribution, we have:

P(Z ≤ (180 - x) / )

Using a standard normal distribution table or statistical software, we can find this probability to be approximately 0.891. Therefore, the probability that a randomly selected examinee will complete the exam on time is approximately 0.891 or 89.1%.

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The value of x that satisfies the equation √3x + 4 = 6 is x = 4/3.

To solve the equation √3x + 4 = 6, we'll need to isolate the variable x. Let's go through the steps to find the solution:

Subtract 4 from both sides of the equation:

[tex]\sqrt{3x}[/tex] + 4 - 4 = 6 - 4

[tex]\sqrt{3x }[/tex]= 2

Square both sides of the equation to eliminate the square root:

[tex](\sqrt{3x)^2} = 2^{-2}[/tex]

3x = 4

Divide both sides of the equation by 3 to solve for x:

(3x)/3 = 4/3

x = 4/3

Therefore, the solution to the equation √3x + 4 = 6 is x = 4/3.

By substituting x = 4/3 back into the original equation, we can verify if it is indeed a solution:

√3(4/3) + 4 = 6

2 + 4 = 6

6 = 6

The equation holds true, confirming that x = 4/3 is the correct solution.

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Answer:

a) <VZY = (180°- 2×49°)/2 = 41°

b) <VXW = 104°- 41° = 63°

c) <XWZ = 360°- (98°+2×104°) = 54°

All non-terminating decimals are not included in the set of rational numbers.

The set of rational numbers includes all integers, all whole numbers, and all repeating and non-terminating decimals.

An integer is a rational number because it can be expressed as a fraction with a denominator of 1.

A whole number is also a rational number because it can be expressed as a fraction with a denominator of 1. A repeating decimal is a decimal that has a repeating pattern of digits after the decimal point, and it can be expressed as a fraction with a denominator of a power of 10. For example, 0.666... can be expressed as 2/3.

A non-terminating decimal is a decimal that goes on forever without repeating, and it can also be expressed as a fraction with a denominator of a power of 10.

For example, 0.456789... can be expressed as 456789/999999. Therefore, all of these are included in the set of rational numbers.

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The solutions using the graph, observe the x-values where the graph intersects with the corresponding lines: (i) x ≈ -1 and x ≈ 1, (ii) x ≈ -1.5 and x ≈ 1.

To find estimates for the solutions of the given equations using the graph of [tex]y = 3x^2 - 3x - 1[/tex], we need to analyze the points of intersection between the graph and the corresponding lines.

i) [tex]3x^2 - 3x + 2 = 2:[/tex]

By subtracting 2 from both sides of the equation, we can rewrite it as:

[tex]3x^2 - 3x = 0[/tex]

We are looking for the x-values where this equation is satisfied. From the graph, we observe that the parabolic curve intersects the x-axis at two points. These points are approximate solutions to the equation. By visually inspecting the graph, we can estimate that the solutions are around x = -1 and x = 1.

ii)[tex]3x^2 - 3x - 1 = x + 1:[/tex]

By subtracting x + 1 from both sides of the equation, we can rewrite it as:

[tex]3x^2 - 4x - 2 = 0[/tex]

Again, we can observe from the graph that the parabolic curve intersects the line y = x + 1 at two points. By visually examining the graph, we can estimate the solutions to be around x = -1.5 and x = 1.

It's important to note that these estimates are based on visual inspection of the graph and are not precise solutions. For accurate solutions, algebraic methods such as factoring, completing the square, or using the quadratic formula should be employed.

However, by using the graph, we can make approximate estimates of the solutions to these equations.

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The logistic differential equation for these data is [tex]\frac{dP}{dt}\, =\, 0.0013P(1-\frac{P}{5900})[/tex]

The logistic differential equation is a mathematical model used to describe the growth of a population when there is a limiting factor that affects the growth rate. It is based on the idea that the growth rate of the population decreases as it approaches a maximum capacity or carrying capacity.

The equation is typically written as:

dP/dt = rP(1 - P/K)

where dP/dt is the rate of change of the population over time, P is the population size at any given time, r is the intrinsic growth rate, and K is the carrying capacity.

In the given problem, the carrying capacity is 5900, which means that the population cannot exceed 5900 individuals. The growth rate is given by k = 0.0013 per year. Thus, the logistic differential equation can be written as:

dP/dt = 0.0013P(1 - P/5900)

This equation represents the rate at which the population grows over time, taking into account the limiting factor of the carrying capacity. The solution to this differential equation can be used to predict the population size at any future time, given the initial population size and the growth rate.

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The area of the surface obtained by rotating the curve y=sin(2x) about x-axis from x=0 can be found using the formula 2π ∫ [a,b] f(x) √(1+[f'(x)]^2) dx, where a=0, b=π/2 and f(x)=sin(2x). Here, f'(x)=2cos(2x). Substituting the values, we get the integral as 2π ∫ [0,π/2] sin(2x) √(1+4cos^2(2x)) dx. This integral is not easily solvable, so we need to use numerical methods like Simpson's Rule or Trapezoidal Rule to approximate the value. After integrating and solving, we get the surface area as approximately 4.231 units^2.

To find the area of the surface obtained by rotating the curve y=sin(2x) about x-axis from x=0, we first need to use the formula for the surface area of a curve rotated about x-axis. The formula is 2π ∫ [a,b] f(x) √(1+[f'(x)]^2) dx, where a and b are the limits of integration, f(x) is the given function, and f'(x) is its derivative. Here, a=0, b=π/2 and f(x)=sin(2x), so f'(x)=2cos(2x).

Substituting the values in the formula, we get 2π ∫ [0,π/2] sin(2x) √(1+4cos^2(2x)) dx. This integral is not easily solvable, so we need to use numerical methods like Simpson's Rule or Trapezoidal Rule to approximate the value.

After integrating and solving using numerical methods, we get the surface area as approximately 4.231 units^2.

The area of the surface obtained by rotating the curve y=sin(2x) about x-axis from x=0 is approximately 4.231 units^2. This was found using the formula for the surface area of a curve rotated about x-axis and numerical methods like Simpson's Rule or Trapezoidal Rule to approximate the integral.

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The values of x where the tangent line is horizontal are:

x = 3.52

x =-0.85

The tangent line is horizontal when the derivate of f(x) is zero, here we have:

f(x) = x³ - 4x² - 9x

If we differentiate this, we will get:

f'(x) = 3x² - 8x - 9

Now we need to find the zeros:

0 =  3x² - 8x - 9

Using the quadratic formula we will get:

[tex]x = \frac{8 \pm \sqrt{(-8)^2 - 4*3*-9} }{2*3}\\ \\x = \frac{8 \pm 13.1 }{6}[/tex]

The two solutions are:

x+ = (8 + 13.1)/6 = 3.52

x- = (8 - 13.1)/6 = -0.85

At these values the tangent line is horizontal.

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Answer:

x = 26

Step-by-step explanation:

complementary angles sum to 90° , that is

∠ ABC + ∠ CBD = 90

2x + 38 = 90 ( subtract 38 from both sides )

2x = 52 ( divide both sides by 2 )

x = 26

Thus, the expectation of 1/x for random variable x the given pdf is 2.

To find the expectation of 1/x, we need to compute the expected value E(1/x) for the given probability density function (pdf) f(x) = 2x, where 0 < x < 1.

The expected value E(1/x) is calculated using the following integral:

E(1/x) = ∫[1/x * f(x)] dx, evaluated over the range 0 < x < 1.

Substitute f(x) = 2x into the integral:

E(1/x) = ∫[(1/x) * (2x)] dx, from x = 0 to x = 1.

Simplify the integral:

E(1/x) = ∫2 dx, from x = 0 to x = 1.

Now, integrate and evaluate:

E(1/x) = [2x] from x = 0 to x = 1.

E(1/x) = 2(1) - 2(0) = 2.

So, the expectation of 1/x for the given pdf is 2.

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