Question 2. 2(x + 3y) + 4(2x + 10) + 5y


Question 3. 2x+105(2x + 4)

Alexia's application of the mathematical expression 4x(4. 8/0. 8) within her invention demonstrated the power of combining scientific knowledge and innovation to solve real-world problems.

In a futuristic city, where advanced technology intertwined with everyday life, a brilliant mathematician named Alexia was working on a groundbreaking invention. She had developed a device capable of manipulating energy fields to alter the physical properties of objects. However, the device required precise calculations to function correctly.

One day, as Alexia was testing her invention, she encountered a critical situation. A malfunction caused a power surge, threatening to overload the entire city's power grid. The surge needed to be redirected and contained before it caused catastrophic damage.

Thinking quickly, Alexia realized that she could utilize her device's energy manipulation capabilities to resolve the crisis. She input the expression 4x(4. 8/0. 8) into the device, representing the redirection of the excessive energy flow.

The device's calculations immediately kicked in, analyzing the expression and providing a solution. As a result, the energy surge was diverted to a safe containment unit, preventing any harm to the city's infrastructure or its inhabitants.

With her invention successfully averting disaster, Alexia's work was recognized globally. Her device became the foundation for a new generation of energy control systems, transforming the way cities managed power. Alexia's ingenuity and quick thinking had not only saved the day but also revolutionized the field of energy management.

In conclusion, Alexia's application of the mathematical expression 4x(4. 8/0. 8) within her invention demonstrated the power of combining scientific knowledge and innovation to solve real-world problems. Her heroic act and subsequent achievements had a profound and lasting impact, improving the lives of countless people and ushering in a new era of sustainable energy management.

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The correct answer is:

Subtract r from both sides of the equation.

To solve the equation h = ab + r for a, Raymond's first step should be to isolate the variable a by performing the necessary operations.

To do this, he should choose option A, which is to subtract r from both sides of the equation. This step helps in isolating the term containing the variable a on one side of the equation.

By subtracting r from both sides, the equation becomes:

h - r = ab

Now, the term containing a is alone on one side of the equation, while the constant terms (h and r) are on the other side.

After completing this step, Raymond can proceed to further manipulate the equation to solve for a. But his first step should be to subtract r from both sides.

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The geometrical forms are matched with the right definition/sentence below.

(H) Circle - The set of all points that are equidistant from a given point called the center.

(K) Radius - A segment whose endpoints are the center of a circle and any point on the circle is a radius.

(J) Diameter - A chord that contains the center of the circle. Twice the radius.

(A) Chord - A segment whose endpoints are on the circle.

(F) Secant - A line that intersects the circle at 2 points.

(E) Tangent - A line in the plane of a circle that intersects the circle at exactly 1 point.

(G) Central Angle - An angle whose vertex is the center of the circle.

(D) Minor Arc - An arc whose measure is less than 180°.

(B) Major Arc - An arc whose measure is more than 180°.

(C) Semi-Circle - An arc whose measure is exactly 180°. The endpoints are on the diameter.

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An equation of a circle that contains the set of points is (x - 6)² + (y + 2)² = 650.

In Mathematics and Geometry, the standard form of the equation of a circle is modeled by this mathematical equation;

(x - h)² + (y - k)² = r²

Where:

By using the distance formula, we would determine the radius based on the center (6, -8) and one of the given points (11, 17);

Radius (r) = √[(x₂ - x₁)² + (y₂ - y₁)²]

Radius (r) = √[(11 - 6)² + (17 + 8)²]

Radius (r) = √[25 + 625]

Radius (r) = √650 units.

By substituting the center (6, -2) and radius of √650 units, we have:

(x - 6)² + (y - (-2))² = (√650)²

(x - 6)² + (y + 2)² = 650

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Using the concept of proportion and ratio, the number of minutes is 6125

Proportion is a mathematical comparison between two numbers.  According to proportion, if two sets of given numbers are increasing or decreasing in the same ratio, then the ratios are said to be directly proportional to each other.

Using the concept of proportion and ratio, we can predict how many minutes it will take them.

13 students = 637 minutes

125 students = x minutes

cross multiply both sides

13 * x = 637 * 125

13x = 79625

Divide both sides by the coefficient of x

13x / 13 = 79625

x = 6125

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Equations 1 and 3 correctly represent the total when three consecutive numbers are added together and then multiplied by three, while equations 2 and 4 do not.

To determine which equations represent the total when three consecutive numbers are added together and then multiplied by three, let's analyze each equation:

Total = 3x + 3x + 1 + 3x + 2

This equation correctly represents the total. Adding three consecutive numbers (3x, 3x + 1, 3x + 2) gives the sum of 9x + 3, and then multiplying it by three yields 27x + 9.

Total = 3x + 3+ + 3 + 3r + 6

This equation is not correct. The expression "3+" is ambiguous and does not represent a specific value.

Total = 3r + 3(r + 1) + 3(«+2)

This equation correctly represents the total. Expanding the expressions within parentheses gives 3r + 3r + 3 + 3 + 6 = 6r + 12.

Total = r + r + 3 + y + 6

This equation is not correct. It introduces a variable "y" which is not defined and is unrelated to the three consecutive numbers.

In conclusion, equations 1 and 3 correctly represent the total when three consecutive numbers are added together and then multiplied by three. These equations are:

Total = 3x + 3x + 1 + 3x + 2

Total = 3r + 3(r + 1) + 3(«+2)

Therefore, the equation would be Total = 3x + 3x + 1 + 3x + 2

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The domain of the function f(x, y) = √(y - x²) / (36 - x²) is x ≠ ±6 and y ≥ x².

Based on the analysis provided, let's summarize the domain of the function f(x, y) = √(y - x²) / (36 - x²):

Step 1: Rule out points where the denominator equals zero and negative values in the square root.

Step 2: The denominator equals zero when x² = 36. Therefore, we must have x ≠ ±6.

Step 3: The numerator √(y - x²) is defined only when y - x² ≥ 0. Therefore, we must have y ≥ x².

Step 4: Combining the above, we determine that the domain of the given function is as follows:

Domain:

x ≠ ±6 (excluding x = ±6)

y ≥ x² (y is greater than or equal to the square of x)

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The basic feasible solutions are the extreme points of the feasible region, and the algorithm moves from one basic feasible solution to another by pivoting.

The simplex method is a systematic method of solving linear programming problems.

The algorithm is iterative and works by testing each vertex of the feasible solution space in turn to determine the optimal solution.

The simplex method terminates when it has determined that no further improvements to the objective function are possible. The simplex method has the advantage of being easy to understand and apply to problems of any size, although it can be slow for very large problems. In the simplex method, the feasible region is divided into polyhedral cones, and the objective function is optimized at the extreme point of each of these cones.

In summary, the main answer is that the simplex method is an algorithm for solving linear programming problems by testing each vertex of the feasible solution space to determine the optimal solution.

Hence, The basic feasible solutions are the extreme points of the feasible region, and the algorithm moves from one basic feasible solution to another by pivoting.

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The required rate for ratio of the two different quantities i.e

Gabby worked 40/5 hours per day.

Arithmetic is the branch of mathematics that deals with the study of numbers using various operations on them. Basic operations of math are addition, subtraction, multiplication and division. These operations are denoted by the given symbols.

Given:

Gabby worked 40 hours in 5 days.

According to given question we have

The ratio of the two quantities of the different kind and in the different units is a fraction that shows how many times one quantity is of the other.

By the use of arithmetic we have,

Gabby worked 40 hours in 5 days means

[tex]\sf 5 \ days= 40 \ hours[/tex]

[tex]\sf 1 \ days = \dfrac{40}{5} \ hours[/tex]

Therefore, the required rate for ratio of the two different quantities i.e

Gabby worked 40/5 hours per day.

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Without more information about the figure and the charges present, it is not possible to determine the magnitude and direction of the force acting on the charge at x = 11.0 cm.

To calculate the force on a charge located at a specific position, we need to consider the interaction with other charges in the vicinity. However, since the figure and additional information are not provided, we are unable to determine the specific configuration and nature of the charges involved. The force on a charge depends on factors such as the distance, charge magnitude, and the nature of the interaction (e.g., electrostatic or gravitational). Therefore, without more information about the figure and the charges present, it is not possible to determine the magnitude and direction of the force acting on the charge at x = 11.0 cm.

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Answer:

give a detailed question

The farmer has 90 meters of fencing available to create a rectangular garden in the middle of an open field. The solution depends on how the farmer decides to allocate the fencing among the length and width.

To maximize the area of the rectangular garden, the farmer needs to determine the dimensions that will utilize the given 90 meters of fencing most effectively. Let's assume the length of the garden is L and the width is W. For a rectangular shape, the perimeter is given by P = 2L + 2W. Since the farmer has 90 meters of fencing, we can write the equation as 2L + 2W = 90. To maximize the area, we need to solve for L and W. Since the perimeter is fixed, the longer one side becomes, the shorter the other side needs to be. The solution depends on how the farmer decides to allocate the fencing among the length and width.

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A reasonable prediction for the number of times a pink paper clip will be drawn is approximately 18 times.

We have,

To make a reasonable prediction for the number of times a pink paper clip will be drawn, we can assume that each paper clip has an equal probability of being drawn since the paper clip is replaced after each draw.

The total number of paper clips in the bag is:

= 9 + 7 + 5 + 4

= 25.

Since the probability of drawing a pink paper clip is 9/25, we can expect that the number of times a pink paper clip will be drawn can be estimated as follows:

Number of times a pink paper clip will be drawn.

= (probability of drawing a pink paper clip) x (total number of draws)

Number of times a pink paper clip will be drawn = (9/25) x 50

Number of times a pink paper clip will be drawn ≈ 18

Therefore,

A reasonable prediction for the number of times a pink paper clip will be drawn is approximately 18 times.

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Set A's intersection with the union of sets B and A is equivalent to set A's intersection with set B.

As a result, the supplied assertion is correct.

The given statement is true and can be proven using set theory. Let A and B be two sets. Then, the intersection of A and the union of B and A is the same as the intersection of A and B. This can be demonstrated as follows:

An(BUA) = {x : x∈A and x∈B or x∈A}

= {x : (x∈A and x∈B) or x∈A}

= {x : x∈A and x∈B} U {x : x∈A}

= ANB U A

Thus, we can see that the intersection of set A with the union of set B and A is equal to the intersection of set A with set B.

Therefore, the given statement is true.

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The mean for the sample is $92 and the standard deviation is $8. To construct an 88% confidence interval for the population mean, we need to calculate the margin of error (EBM) and use the z-score corresponding to the desired confidence level.

To identify the mean and standard deviation for the sample, we are given that X follows a normal distribution with a mean of $92 and a standard deviation of $8.

To construct an 88% confidence interval for the population mean, we follow these steps:

1. Determine the critical value, z, using the desired confidence level. In this case, the confidence level is 88%, so we need to find the z-score that corresponds to an 88% confidence level.

2. Calculate the margin of error (EBM) using the formula EBM = z * (standard deviation / sqrt(sample size)).

3. Determine the lower and upper bounds of the confidence interval by subtracting and adding the margin of error from the sample mean.

To find the mean and standard deviation for the sample, we are given:

Mean (μ) = $92

Standard deviation (σ) = $8

To construct an 88% confidence interval, we need to find the critical value z. Using a standard normal distribution table or a calculator, the critical value corresponding to an 88% confidence level is approximately 1.553.

Next, we calculate the margin of error (EBM):

EBM = z * (standard deviation / sqrt(sample size))

EBM = 1.553 * ($8 / sqrt(49))

EBM ≈ $2.235

The lower bound of the confidence interval is the sample mean minus the margin of error:

Lower bound = $92 - $2.235 ≈ $89.765

The upper bound of the confidence interval is the sample mean plus the margin of error:

Upper bound = $92 + $2.235 ≈ $94.235

Therefore, the 88% confidence interval for the population mean is approximately $89.765 to $94.235.

Using the calculator to construct the confidence interval for a 92% confidence level with the same mean ($92) and standard deviation ($8), we find that the interval is approximately $90.587 to $93.413.

To find the minimum number of participants needed to be 95% confident that the estimated sample mean is within two dollars of the true population mean, we can use the formula:

Sample size (n) = (z * standard deviation / margin of error)^2

Substituting the values into the formula:

n = (1.96 * $8 / $2)^2

n ≈ 153.76

Therefore, the minimum number of participants needed is approximately 154 to be 95% confident that the estimated sample mean is within two dollars of the true population mean.

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The number of students who take only lunch or dinner but not both is 50

Since Venn diagram is used to visually represent the differences and the similarities between two concepts.

Given that all 70 students take lunch or dinner or both meals at the hostel.

students take lunch or dinner or both meals at the hostel = 70

lunch = 30

dinner= 50

Students who both or any one of the drinks= 900-125=725

Now number of students who take only lunch or dinner but not both

= 50 - 30

= 20

Then 20 + 30 = 50

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The values of x for which the series converges can be expressed as the entire real number line, or in interval notation, (-∞, +∞).

To determine the values of x for which the series converges, we need to analyze the given series:

∑ (x - 1)^n / (5^n)

Let's break down the problem step by step.

First, let's consider the ratio test, which is a useful tool for determining the convergence of a series. The ratio test states that if the absolute value of the ratio of consecutive terms approaches a limit L as n approaches infinity, then the series converges if L < 1 and diverges if L > 1.

Using the ratio test, let's calculate the ratio of consecutive terms:

| [(x - 1)^(n+1) / (5^(n+1))] / [(x - 1)^n / (5^n)] |

= | (x - 1)^(n+1) / (5^(n+1)) * (5^n) / (x - 1)^n |

= | (x - 1)^(n+1) / (5(x - 1))^n |

We simplify further:

= | (x - 1) / (5(x - 1)) |^n

= | 1/5 |^n

Now, we can see that the ratio does not depend on x. It simplifies to a constant value of 1/5. Since the absolute value of this constant is less than 1 (i.e., |1/5| < 1), the series will converge for all values of x.

In other words, the series converges for any value of x.

Therefore, the values of x for which the series converges can be expressed as the entire real number line, or in interval notation, (-∞, +∞).

In summary, the given series, ∑ (x - 1)^n / (5^n), converges for all values of x. This conclusion is reached by applying the ratio test, which shows that the ratio of consecutive terms is a constant value of 1/5, which is less than 1. As a result, the series converges for any real value of x.

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Answer:

A. 5

Step-by-step explanation:

x=5

Answer:

A

Step-by-step explanation:

Thier equal so 78-18=60

60/12=5

The area of the shaded part is 463.4π cm²

The area of a shape is the space occupied by the boundary of a plane figures like circles, rectangles, and triangles.

The area of the shaded part = area of circle - area of segment.

Area of circle = πr²

= 3.14 × 24²

= 576π cm²

Area of segment = area of sector - area of triangle

Area of sector = 120/360 × 576π

=576π/3

= 192πcm²

Area of triangle = 1/2absinC

= 1/2 × 24² sin120

= 249.42

= 79.4π cm²

Area of segment = 192π- 79.4π

= 112.6π

Area of the shaded part = 576π -112.6π

= 463.4 π

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The rectangular coordinates of the polar coordinates (√35, -π/8) are approximately (5.932, -0.3927).

To convert polar coordinates (r, θ) to rectangular coordinates (x, y), we can use the following relationships:

x = r * cos(θ)

y = r * sin(θ)

In this case, we have the polar coordinates (√35, -π/8).

First, we calculate x:

x = √35 * cos(-π/8) ≈ 5.932 * cos(-0.3927) ≈ 5.932 * 0.919 ≈ 5.453

Next, we determine y:

y = √35 * sin(-π/8) ≈ 5.932 * sin(-0.3927) ≈ 5.932 * (-0.394) ≈ -2.337

Therefore, the rectangular coordinates of the polar coordinates (√35, -π/8) are approximately (5.932, -0.3927). The x-coordinate represents the horizontal distance from the origin, and the y-coordinate represents the vertical distance from the origin. The negative angle indicates a counterclockwise rotation from the positive x-axis.

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Answer:

IG: yiimbert

We can use the formula for compound interest to solve this problem:

A = P(1 + r/n)^(nt)

where:

A = final amount ($600)

P = principal amount ($500)

r = annual interest rate (5% or 0.05 as a decimal)

n = number of times interest is compounded per year (we'll assume it's compounded monthly, so n = 12)

t = time in years

Substituting the given values, we get:

$600 = $500(1 + 0.05/12)^(12t)

Dividing both sides by $500, we get:

1.2 = (1 + 0.05/12)^(12t)

Taking the natural logarithm (ln) of both sides, we get:

ln(1.2) = ln[(1 + 0.05/12)^(12t)]

Using the property of logarithms, we can bring the exponent down:

ln(1.2) = (12t) ln(1 + 0.05/12)

Dividing both sides by 12 ln(1 + 0.05/12), we get:

t = ln(1.2) / [12 ln(1 + 0.05/12)]

Using a calculator, we can evaluate this expression and find that:

t ≈ 2.26 years

Therefore, it will take approximately 2.26 years for the account to reach $600 with an interest rate of 5% and monthly compounding.

The value of C(-1) is -5 found for the given value of the function.

Functions: Functions are a collection of ordered pairs, where the first element of each pair is from the domain, and the second element is from the range. Functions help to model real-world problems or situations.

It takes one or more input values and produces a single output value.Functions can be represented using different methods such as equations, tables, and graphs.

In mathematics, a function can be represented by a graph, where the input value is plotted on the x-axis, and the output value is plotted on the y-axis.

A function can also be represented using a table, where each row represents an input value and the corresponding output value.

In economics, functions are used to model the relationship between inputs and outputs, such as the relationship between supply and demand.

Given function is C(x) = −4x² + 4x +3

The value of C(x) is to be calculated at x = -1.

So, C(-1) = -4(-1)² + 4(-1) + 3

C(-1) = -4 + (-4) + 3

= -5.

Hence, the value of C(-1) is -5.

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Using Lagrange multipliers, we set up a system of equations involving the objective function and the constraint function and solve for the critical points.

To find the extremum of the function f(x, y) = x^2 - 6xy^2 - 14y + 47 subject to the constraint xy = 14, we can use the method of Lagrange multipliers. The method involves introducing a new variable, called the Lagrange multiplier, and setting up a system of equations to find the critical points of the function subject to the constraint.

Let's denote the Lagrange multiplier by λ. The objective function and the constraint function are:

Objective function: f(x, y) = x^2 - 6xy^2 - 14y + 47

Constraint function: g(x, y) = xy - 14

We set up the following system of equations:

∇f(x, y) = λ ∇g(x, y)

g(x, y) = 0

To find the partial derivatives of f(x, y) and g(x, y), we have:

∂f/∂x = 2x - 6y^2

∂f/∂y = -12xy - 14

∂g/∂x = y

∂g/∂y = x

Setting up the equations, we have:

2x - 6y^2 = λy

-12xy - 14 = λx

xy - 14 = 0

From the third equation, we get xy = 14. Substituting this into the second equation, we have:

-12(14/y) - 14 = λx

-168/y - 14 = λx

-14(12/y + 1) = λx

-168 - 14y = λxy

Substituting xy = 14, we obtain:

-168 - 14y = 14λ

Simplifying, we get:

14y + 14λ = -168

Dividing by 14, we have:

y + λ = -12

From the first equation, we have:

2x - 6y^2 = λy

2x - 6(y^2 + 2y + 1) = λ(y + 2)

2x - 6y^2 - 12y - 6 = λy + 2λ

2x - 6y^2 - (12 + λ)y - (6 + 2λ) = 0

Substituting xy = 14, we have:

2x - 6(14/x)^2 - (12 + λ)(14/x) - (6 + 2λ) = 0

Simplifying, we obtain:

2x - (588/x^2) - (168 + 14λ)/x - (6 + 2λ) = 0

Multiplying through by x^2, we get:

2x^3 - 588 - (168 + 14λ)x - (6 + 2λ)x^2 = 0

This equation, along with the equation y + λ = -12, forms a system of equations that can be solved to find the values of x, y, and λ.

Unfortunately, solving this system of equations analytically can be quite complex and may require numerical methods. However, once the values of x, y, and λ are determined, you can substitute them back into the objective function f(x, y) to obtain the extremum.

In summary, the solution involves finding the values of x, y, and λ that satisfy the equations.

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Answer:

Step-by-step explanation:

Student's t test for correlated groups reduces to Student's t test for single samples using difference scores. Therefore, the correct answer is (b).

In a t test for correlated groups (also known as paired-samples or dependent-samples t test), the same group of participants is measured twice, under two different conditions or at two different times. The difference between the two measurements for each participant is calculated and used as the sample data. The t test for correlated groups compares the mean difference score to zero to determine if there is a significant difference between the two conditions or times.

This can be seen as equivalent to a t test for single samples using difference scores, where the mean difference score is compared to a known or hypothesized value of the population mean difference. In fact, the formula for calculating the t statistic is the same in both cases.

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There will be 30 trucks when there are 5 cars, maintaining the 1:6 ratio.

Given that the ratio of cars to trucks is 1:6, we can determine the number of trucks by multiplying the number of cars by the ratio. If there are 5 cars, we can calculate the number of trucks using the ratio.

Let's assume the number of trucks as "x." According to the given ratio, we have the equation:

1 car : 6 trucks = 5 cars : x trucks

To solve for x, we can set up a proportion:

1/6 = 5/x

Cross-multiplying, we get:

1 * x = 6 * 5

x = 30

Therefore, there will be 30 trucks when there are 5 cars, based on the given ratio of 1:6.

Alternatively, we can calculate the number of trucks by dividing the number of cars by the fraction representing the ratio:

Number of trucks = (Number of cars) / (Ratio of cars to trucks)

Number of trucks = 5 / (1/6)

Number of trucks = 5 * (6/1)

Number of trucks = 30

So, there will be 30 trucks when there are 5 cars, maintaining the 1:6 ratio.

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The chart should be completed as follows;

x           [tex]f(x) = 1.7^x[/tex]               function (x, f(x))               Inverse (f(x), x)

0               1                             (0, 1)                                 (1, 0)

1                1.7                          (1, 1.7)                               (1.7, 1)

-1               0.6                         (-1, 0.6)                            (0.6, -1)

2                2.9                          (2, 2.9)                           (2.9, 2)

3                4.9                          (3, 4.9)                            (4.9, 3)

In Mathematics and Geometry, an exponential function can be modeled by using this mathematical equation:

[tex]f(x) = a(b)^x[/tex]

Where:

Based on the given exponential function [tex]f(x) = 1.7^x[/tex], we would determine the value of f(x) by substituting each of the x-values as follows;

x = 1

[tex]f(x) = 1.7^1[/tex]

f(x) = 1.7

When x = -1, we have:

[tex]f(x) = 1.7^{-1}[/tex]

f(x) = 0.6

When x = 2, we have:

[tex]f(x) = 1.7^{2}[/tex]

f(x) = 2.9

When x = 3, we have:

[tex]f(x) = 1.7^{3}[/tex]

f(x) = 4.9

In conclusion, the inverse of this exponential function would be determined by interchanging (swapping) the x-value (x) and the y-value f(x) as shown in the chart above.

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Triangle GHJ and triangle LKM are similar because they possess identical proportions, despite probable size variations

We need to know the properties of similar triangles.

These properties includes;

This characteristic of the property enables the derivation of diverse relationships and theorems in the field of geometry that involve triangles with identical shapes.

We can see that Triangle GHJ and triangle LKM are similar.

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The equation for the quadratic relationship graphed below is  y=−(5/9)​x2−(10/9)​x^2+1.

We are given that;

The graph of the equation

Now,

Substituting these values into the equation for a quadratic function:

y=a(0)2+b(0)+c

1=c

So we know that c=1

Next, we can use the vertex form of a quadratic function to find the value of a:

y=a(x−h)2+k

where (h,k) is the vertex of the parabola. Substituting (-1,-2) for (h,k):

y=a(x+1)2−2

Now we need to find the value of a. We can use the point (2,-3) on the parabola to solve for a:

−3=a(2+1)2−2

−3=9a−2

a=−95​

Therefore, by quadratic equation the answer will be y=−(5/9)​x2−(10/9)​x^2+1.

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Answer:

112x − 168y

Step-by-step explanation:

First you want to apply the distributive property −14(−8x+12y)  -14 x -8 = 112x, -14 x 12y = 168 y then you want to turn it into a equation to get 112 x -168y

The lemonade that roseanne's brother drink is  1/2  liter

To find out how much lemonade Roseanne's brother consumes, we need to calculate the fraction of the remaining lemonade that he consumes.

Initially, Roseanne makes 1 1/2 liters of strawberry lemonade.

She pours 1/4 of a liter into a thermos, which leaves her with (1 1/2) - (1/4) = 1 1/4 liters of lemonade.

Her brother then consume 2/5 of the remaining lemonade.

To find out how much lemonade he consume, we can multiply the fraction by the total amount remaining:

Lemonade consumed by brother = (2/5) * (1 1/4)

To simplify the calculation, we can convert the mixed number (1 1/4) to an improper fraction:

1 1/4 = (4/4) + (1/4) = 5/4

Substituting this value back into the equation:

Lemonade consumed by brother = (2/5) * (5/4) = 10/20 = 1/2

Therefore, Roseanne's brother consume 1/2 of a liter of lemonade.

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