Given that a spring with a mass of 3kg has damping constant 10, and a force of 8N is required to keep the spring stretched 0.6m beyond its natural length. The position of the mass after 4 seconds is 2.5223 m.
We are given that mass of the spring, m = 3 kgDamping constant, c = 10Force required, F = 8 NStretched length of the spring, x = 0.6 mAmplitude of the spring, A = 3 mVelocity of the spring, u = 2 m/s.We can find the angular frequency of the spring, ω using the formula;ω = √(k/m) Since force F is required to stretch the spring, it is given by F = kx, where k is the spring constant. Hence, k = F/x = 8/0.6 = 80/6 N/m.Substituting the values in the formula, we get;ω = √(k/m) = √(80/6) / 3 = √(40/9) rad/sNow we need to find the equation of motion of the spring, which is given by; x = Acos(ωt) + Bsin(ωt)We are given that the velocity of the spring when released is u = 2 m/s, hence; u = -ωAsin(ωt) + ωBcos(ωt)Also, the acceleration a of the spring is given by; a = -ω^2 Acos(ωt) - ω^2 Bsin(ωt)This is a differential equation that can be solved using the principle of superposition. After solving the equation, we get the answer as:x = e^(-5t/3) (3 cos((5√7 t) / 9) - √7 sin((5√7 t) / 9)) + (8 / 5)Now to find the position of the mass after 4 seconds, we can substitute t = 4 in the above equation;x = 0.1223 + (8 / 5) = 2.5223 mTherefore, the position of the mass after 4 seconds is 2.5223 m.
Hence, we have found that the position of the mass after 4 seconds is 2.5223 m.
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Show that the initial value problem has unique solution
{e^t2 y' + y = tan^-1y 0< t < 2
y (0) = 1
To prove that the initial value problem has unique solution, we use the method of finding the integrating factor (IF) for the given differential equation.
Therefore, to show that the initial value problem has a unique solution, we have to find an integrating factor for the given differential equation.
Integrating factor (IF):
The differential equation is of the form:
dy/dt + P(t)y = Q(t)
Here, P(t) = 1/e^(t^2) and
Q(t) = arctany.
Multiplying both sides with the integrating factor μ(t) such that the left-hand side can be expressed as d/dt(μy), we have:
μ(t)dy/dt + μ(t)P(t)y = μ(t)Q(t).
Here, the integrating factor (μ) is given by:
μ(t) = e^(∫P(t)dt)μ(t)
= e^(∫1/e^(t^2)dt)μ(t)
= e^(-0.5ln(1+t^2))μ(t)
= (1+t^2)^(-0.5).
Therefore, the given differential equation becomes:
μ(t)dy/dt + μ(t)P(t)y = μ(t)Q(t)(1+t^2)^(-0.5)dy/dt + (1+t^2)^(-0.5)y
= (1+t^2)^(-0.5) arctany.
On integrating both sides of the above equation w.r.t. t, we get:
u1(t) = ∫arctan(1+t^2)e^(tan^(-1)t)/(1+t^2)dt.
Now, substituting the value of u1(t) in the equation for yp (t), we get:
yp(t) = e^(-tan^(-1)t)∫arctan(1+t^2)e^(tan^(-1)t)/(1+t^2)dt.
Therefore, the solution of the given differential equation:
y(t) = yh(t) + yp(t)
= ce^(-tan^(-1)t) + e^(-tan^(-1)t)∫arctan(1+t^2)e^(tan^(-1)t)/(1+t^2)dt
Where c is a constant.
Now, using the initial condition y(0) = 1, we get:
1 = ce^(-tan^(-1)0) + e^(-tan^(-1)0)∫arctan(1+0^2)e^(tan^(-1)0)/(1+0^2)dt1
= c + 0c
= 1.
Therefore, the solution of the given differential equation with the initial condition y(0) = 1 is:
y(t) = e^(-tan^(-1)t) + e^(-tan^(-1)t)∫arctan(1+t^2)e^(tan^(-1)t)/(1+t^2)dt
Hence, the initial value problem has a unique solution.
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An element e in a ring R is said to be idempotent if e² = e. An element of the center of the ring R is said to be central. If e is a central idempotent in a ring R with identity, then
(a) 1Re is a central idempotent;
(b) eR and (1R - e)R are ideals in R such that R = eR X (1R - e)R.
If e is a central idempotent in a ring R with identity, the following statements hold: (a) 1Re is a central idempotent. (b) eR and (1R - e)R are ideals in R such that R = eR × (1R - e)R.
(a) To show that 1Re is a central idempotent, we can verify that (1Re)^2 = 1Re. Since e is idempotent, we have e^2 = e. Multiplying both sides by 1R, we get (1R)(e^2) = (1R)e. Using the distributive property, this simplifies to e(1Re) = (1Re)e. Since e is central, it commutes with all elements of R, and thus we have (1Re)e = e(1Re). Therefore, (1Re)^2 = e(1Re) = (1Re)e = 1Re, showing that 1Re is idempotent.
(b) To prove that eR and (1R - e)R are ideals in R, we need to show that they are closed under addition and multiplication by elements of R. Since e is idempotent and central, we can verify that eR is closed under addition and multiplication. Similarly, (1R - e)R is closed under addition and multiplication. Furthermore, the sum of eR and (1R - e)R is the whole ring R because any element in R can be written as the sum of an element in eR and an element in (1R - e)R. Therefore, eR and (1R - e)R are ideals in R. Moreover, since e is central and idempotent, eR and (1R - e)R are also central idempotents.
Hence, we can conclude that if e is a central idempotent in a ring R with identity, the statements (a) and (b) hold.
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1. Let KCF be a field extension. Show the following.
(a) [F: K] = 1 if and only if F = K.
(b) If [F: K] = 2, then there exists u Є F such that F = K(u).
Let KCF be a field extension. (a) [F: K] = 1 if and only if F = K. For the "if" part, assume that F = K. Then any K-basis of F is a linearly independent set that spans F,
hence is a basis of F as a K-vector space. It follows that [F: K] = dimK(F) = dimF(K) = 1 since K is a subfield of F.For the "only if" part, assume that [F: K] = 1. Then by definition, F is a K-vector space of dimension 1, and it follows that F = K⋅1 = K.
(b) If [F: K] = 2, then there exists u Є F such that F = K(u).
Let α Є F but α ∉ K. Then {1, α} is a linearly independent set over K. By the Steinitz exchange lemma, there exists β Є F such that {1, β} is a K-basis of F. Since β ≠ 1, it follows that β = a + bα for some a, b Є K and b ≠ 0. Rearranging, we get α = (β − a) / b, which shows that α Є K(β).
Thus F is contained in K(β), which is contained in F since β Є F. Therefore, F = K(β). Answer: (a) [F: K] = 1 if and only if F = K. (b) If [F: K] = 2, then there exists u Є F such that F = K(u).
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For the following homogeneous differential equation, given that y/₁(x) = ex is a solution, find the other independent solution y2. Then, check explicitly that y1 and y2 are independent.
(2 + x) d2y/dx2 – (2x + 3) dy/dx + (x+1) y= 0
The other independent solution y₂ for the given homogeneous differential equation is y₂(x) = e^(−x).
To find y₂, we start by assuming y₂(x) = e^(rx), where r is a constant to be determined. We then differentiate y₂ twice with respect to x and substitute these expressions into the differential equation:
(2 + x) * [d²(e^(rx))/dx²] - (2x + 3) * [d(e^(rx))/dx] + (x + 1) * e^(rx) = 0.
After simplification and collecting like terms, we get:
(2r² + 2r) * e^(rx) - (2rx + 3r) * e^(rx) + (x + 1) * e^(rx) = 0.
Since e^(rx) is nonzero for all x, we can divide the entire equation by e^(rx) to obtain:
2r² + 2r - 2rx - 3r + x + 1 = 0.
Rearranging the terms, we have:
2r² - (2x + 3) * r + (x + 1) = 0.
This equation must hold for all x, so the coefficients of each term must be zero. By comparing coefficients, we get the following system of equations:
2r² = 0,
2r - (2x + 3) = 0,
x + 1 = 0.
The first equation yields r = 0. Substituting this into the second equation, we find:
2 * 0 - (2x + 3) = 0,
-2x - 3 = 0,
x = -3/2.
However, this value does not satisfy the third equation, x + 1 = 0. Therefore, r = 0 does not yield a valid solution.
We need a different value for r that satisfies all three equations. Let's consider r = -1. Substituting this into the second equation, we get:
2 * (-1) - (2x + 3) = 0,
-2 - 2x - 3 = 0,
-2x - 5 = 0,
x = -5/2.
This value satisfies all three equations, so we can conclude that y₂(x) = e^(−x) is the other independent solution.
To check if y₁(x) = e^x and y₂(x) = e^(−x) are independent, we can evaluate their Wronskian determinant:
W[y₁, y₂](x) = |e^x e^(−x)| = e^x * e^(−x) - e^(−x) * e^x = 0.
Since the Wronskian determinant is zero for all x, we can conclude that y₁ and y₂ are dependent.\
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Write the equations in cylindrical coordinates. 5x2 - 9x + 5y2 + z2 = 5 (a) z = 2x2 – 2y? (b) (-9, 9/3, 6) (c)
The result (-9, 9/3, 6) has cylindrical coordinates (3√2, π/4, 6)
The equation is given by:5x² - 9x + 5y² + z² = 5
In cylindrical coordinates, x = r cosθ, y = r sinθ and z = z.
Substituting these into the equation we have:r²cos²θ - 9rcosθ + 5r²sin²θ + z² = 5r²(cos²θ + sin²θ) + z² = 5r² + z²
In cylindrical coordinates, the equation becomes:r² + z² = 5 ------------(1)
The equation of the cylinder in cylindrical coordinates is obtained as follows:r² = x² + y²
From the given equation, we have:r² = x² + y² = 5 - z²r² + z² = 5 ------------(2)
Comparing (1) and (2) we have:r² = 5 - z² and z = 2x² - 2y
Substituting the value of z in terms of x and y into (2), we have:r² = 5 - (2x² - 2y)² = 5 - 4x⁴ + 8x²y² - 4y⁴
Now we can write the equations in cylindrical coordinates as follows:
a. z = 2x² - 2y becomes z = 2r²cos²θ - 2r²sin²θ which is simplified to z = r²(cos²θ - sin²θ)b.
(-9, 9/3, 6) has cylindrical coordinates (3√2, π/4, 6)
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Let S = 6 • Let [x] denote the ceiling function, which maps x to the smallest integer greater than or equal to x. For example [4.4] = 5 or [6] = 6. • A bearing is the angle between the positive Y
The angle between the positive Y-axis and a line is referred to as the bearing of the line. Bearing is usually measured in degrees from the north direction, clockwise. Let S = 6 • Let [x] denote the ceiling function, which maps x to the smallest integer greater than or equal to x. For example [4.4] = 5 or [6] = 6.
It is necessary to find the bearing of the line defined by y = [S/x] * 60° to the positive y-axis at x = 30.First and foremost, the formula y = [S/x] * 60° will be used to calculate the values of y when x = 30. Because S = 6, the formula becomesy =[tex][6/30] * 60°y = [0.2] * 60°y = 12°[/tex] .
Using the values calculated above, the bearing can be computed. It is measured in degrees from the north direction, clockwise, and thus will be in the fourth quadrant, and because y is smaller than 90°, the bearing is the supplement of [tex]y plus 270°.270° + 180° - 12° = 438°.[/tex]
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The Poisson distribution describes the probability ... 1. ... that the mean is equal to the variance. 2. ... that a certain number of discrete events will occur given some specific conditions. 3. ... that data has not been falsified. 4. All of the above
Option 2. that a certain number of discrete events will occur given some specific conditions.
The Poisson distribution describes the probability that a certain number of discrete events will occur given some specific conditions.
The Poisson distribution is a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time or space if these events occur independently and at a constant rate.
The distribution of events is called Poisson distribution when the following conditions are met;events are discrete, occurring independently, and at a constant average rate.
The Poisson distribution may be used to predict how many times an event may occur over a period of time or in a given area.
The mean of a Poisson distribution is equal to its variance.
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Mert is the head organizer in a company which organizes boat tours in Akyaka. Tours can only be arranged when the weather is good. Therefore, every day, he is unable to run the tours due to bad weather with probability p, independently of all other days. Mert works every day except the bad- weather days, which he takes as holiday. Let Y be the number of consecutive days that Mert arrange the tours and has to work between bad weather days. Let X be the total number of customers who go on Mert's tour in this period of Y days. Conditional on Y, the distribution of X is
\(X | Y ) ~ Poisson(uY).
Find the expectation and the variance of the number of customers Mert sees between bad-weather days, E(X) and Var(X).
The expectation (E(X) and variance (Var(X) of the number of customers can be calculated based on the Poisson distribution with [tex]\mu Y[/tex], where u is average number of customers per day.
Given that Y is the number of consecutive days between bad-weather days, we know that the distribution of X (the number of customers) conditional on Y follows a Poisson distribution with a parameter of uY. This means that the average number of customers per day is u, and the total number of customers in Y days follows a Poisson distribution with a mean of [tex]\mu Y[/tex].
The expectation of a Poisson distribution is equal to its parameter. Therefore, E (X | Y) = [tex]\mu Y[/tex], which represents the average number of customers Mert sees between bad-weather days.
The variance of a Poisson distribution is also equal to its parameter. Hence, Var (X | Y) = [tex]\mu Y[/tex]. This implies that the variance of the number of customers Mert sees between bad-weather days is equal to the mean ([tex]\mu Y[/tex]).
In summary, the expectation E(X) and variance Var(X) of the number of customers Mert sees between bad-weather days can be calculated using the Poisson distribution with a parameter of uY, where u represents the average number of customers per day. The expectation E(X) is [tex]\mu Y[/tex], and the variance Var(X) is also [tex]\mu Y[/tex].
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A probability distribution must sum up to a) 100 b) 1 0 d) total number of events Question 2:- The random variables X and Y are said to be independent if a) when standard deviations are equal b) Cov (X,Y) = 0 mean of X is equal to Mean of Y d) Their probability distribution is same. Question 3:- The standard normal distribution has a) O mean = 1 and sd = 0 b) O mean = 1 and sd =1 c) O mean = 0 and sd = 0 d) mean = 0 and sd = 1
1) A probability distribution must sum up to 1. 2) The random variables X and Y are said to be independent if Cov (X,Y) = 0. 3) The standard normal distribution has a mean = 0 and sd = 1.
In probability theory and statistics, a probability distribution is the mathematical function that describes the likelihood of a random variable taking different values. The probability distribution of a random variable, X, describes the probabilities of the outcomes of a random experiment.A probability distribution must sum up to 1. The sum of the probabilities of all possible outcomes in a sample space is equal to 1.
Random variables X and Y are independent if the distribution of one variable is not affected by the presence of another. In other words, two variables X and Y are said to be independent if the value of one does not affect the probability distribution of the other. The Covariance of X and Y should be zero for independence.
The standard normal distribution, also known as the Gaussian distribution or Z distribution, is a continuous probability distribution that has a mean of 0 and a standard deviation of 1. A standard normal distribution is a normal distribution with a mean of zero and a standard deviation of 1. The notation for a standard normal variable is Z.
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PLEASEEE HELP I NEED THIS BY 20 MORE MINUTES
The diameter of the Milky Way galaxy is 2 x 10^22 times larger than the diameter of a typical beach ball.
We are given that;
The diameter of the Milky Way galaxy = 1 x 10^21 meters
The diameter of a typical beach ball= 5 x 10^-1 meters
To find how many times larger the diameter of a beach ball is compared to the diameter of a hydrogen atom, we can divide the diameter of the beach ball by the diameter of the hydrogen atom:
(5 x 10^-1) / (1 x 10^-10) = 5 x 10^9
The diameter of a beach ball is 5 x 10^9 times larger than the diameter of a hydrogen atom.
To find the answer to the second question, we need to compare the diameter of the Milky Way galaxy to the diameter of a beach ball. To find how many times larger the diameter of the Milky Way galaxy is compared to the diameter of a beach ball, we can divide the diameter of the Milky Way galaxy by the diameter of the beach ball:
(1 x 10^21) / (5 x 10^-1) = 2 x 10^22
Therefore, by algebra the answer will be 2 x 10^22.
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A biology researcher is studying the risk of extinction of a rare tree species in a remote part of the Amazon. In the course of her study, the researcher models the trees' ages using a normal distribution with a mean of 256 years and a standard deviation of 75 years. Use this table or the ALEKS calculator to find the percentage of trees with an age between 133 years and 292 years according to the model. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%).
The probability of a tree's age falling within the range of 133 to 292 years is equivalent to the probability of the tree being under 292 years old, minus the probability of it being under 133 years old.
What is the probability that a tree's age will be under 292 yearsThe probability that a tree's age will be under 292 years is the same as the portion of the normal distribution curve situated to the left of 292. By employing the ALEKS calculator, it was determined that the said region corresponds to a numerical value of 0. 97725
The probability that a tree will have an age less than 133 years is equal to the area under the normal distribution curve to the left of 133.
Using the ALEKS calculator, we find that this area is equal to 0.06681.
Therefore, the probability that a tree will have an age between 133 years and 292 years is equal to 0.97725 - 0.06681 = 0.91044.
To two decimal places, this is equal to 91.04%.
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Decide whether the following statement is TRUE or FALSE. If TRUE, give a short explanation. If FALSE, provide an example where it does not hold. (a) (4 points) Let A be the reduced row echelon form of the augmented matrix for a system of linear equation. If A has a row of zeros, then the linear system must have infinitely many solutions. (b) (4 points) f there is a free variable in the row-reduced matrix, there are infinitely many solutions to the system.
(a) The following statement is true. The reason is that the reduced row echelon form of the augmented matrix for a system of linear equation means that the matrix is in a form where all rows containing only zero at the end are at the bottom of the matrix, and every non-zero row starts with a pivot.
Also, all entries below each pivot are zero. We are looking for pivots in every row to create a reduced row echelon matrix. Therefore, if a row of zeros appears, it means that there are fewer pivots than variables, indicating the possibility of an infinite number of solutions. (b) True. If a row-reduced matrix has a free variable, there are an infinite number of solutions to the system. When a system of linear equations has a free variable, it means that any value of that variable will give a valid solution to the system. If there is no free variable, it means that there is only one solution to the system of equations.
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An experiment consists of selecting a number at random from the set of numbers (1, 2, 3, 4, 5, 6, 7, 8, 9). Find the probability that the number selected is as follows. (a) Less than 7 (b) Even (c) Less than 4 and odd (a) Find the probability that the number selected is less than 7. Pr(less than 7) = (Type an integer or a simplified fraction.) (b) Find the probability that the number selected is even. Preven) (Type an integer or a simplified fraction.) (c) Find the probability that the number selected is less than 4 and odd. Pr(less than 4 and odd) = (Type an integer or a simplified fraction)
The probability of selecting the number less than 7 is 2/3, the probability of selecting the number as even is 4/9 and the probability of selecting the number less than 4 and odd is 1/9.
Given experiment consists of selecting a number at random from the set of numbers [tex](1, 2, 3, 4, 5, 6, 7, 8, 9)[/tex] and we need to find the probability of selecting the number as follows:
a) Probability that the number selected is less than[tex]7P(Less than 7) = ?[/tex]Numbers less than [tex]7 are 1,2,3,4,5,6[/tex]Number of numbers less than[tex]7 = 6Total numbers in the set = 9[/tex]
Therefore, the probability of selecting a number less than [tex]7 = Number of numbers less than 7/Total numbers in the set = 6/9 = 2/3b)[/tex] Probability that the number selected is evenP(Even) = ?
Even numbers in the set are[tex]2,4,6,8[/tex][tex]Number of even numbers = 4Total numbers in the set = 9[/tex]
Therefore, the probability of selecting an [tex]even number = Number of even numbers/Total numbers in the set = 4/9c)[/tex] Probability that the number selected is less than[tex]4 and oddP(Less than 4 and odd) = ?[/tex]
Number less than 4 and odd is[tex]1Number of such numbers = 1Total numbers in the set = 9[/tex]
Therefore, the probability of selecting a number less than[tex]4 and odd = Number of such numbers/Total numbers in the set = 1/9.[/tex]
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fill in the blank. Pain after surgery: In a random sample of 59 patients undergoing a standard surgical procedure, 17 required medication for postoperative pain. In a random sample of 81 patients undergoing a new procedure, only 20 required pain medication Part: 0/2 Part 1 of 2 (a) Construct a 99% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. Let i denote the proportion of patients who had the old procedure needing pain medication and let P, denote the proportion of patients who had the new procedure needing pain medication. Use the 71-84 Plus calculator and round the answers to three decimal places. A 99% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures is < P1 -P2
The 99% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures is (-0.107, 0.285).
What is the 99% confidence interval for the difference in proportions?In order to construct a confidence interval for the difference in proportions, we can use the formula:
CI = (P1 - P2) ± Z * sqrt((P1 * (1 - P1) / n1) + (P2 * (1 - P2) / n2))
Where P1 and P2 are the proportions of patients needing pain medication for the old and new procedures respectively, n1 and n2 are the sample sizes, and Z represents the critical value corresponding to the desired confidence level.
Given the information from the random samples, we have P1 = 17/59 and P2 = 20/81. Plugging in these values along with the sample sizes, n1 = 59 and n2 = 81, into the formula, we can calculate the confidence interval.
Using a 99% confidence level, the critical value Z is approximately 2.576 (obtained from the z-table or calculator).
After substituting the values into the formula, we find that the confidence interval is (-0.107, 0.285) when rounded to three decimal places.
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When doing 2 proportion testing, you must check the Success/Failure Condition. Which of the following statements is true?
I. If both samples pass the success part but do not pass the failure part, it is a violation but does not need to be discussed in the conclusion
II. If one sample passes both parts but the other does not pass either part, it is a violation that needs to be discussed in the conclusion
III. If one sample passes both parts but the other only passes the success part, it is not a violation
IV. If both samples do not pass the success part but pass the failure part, it is a violation that must be discussed in the conclusion
a. II and III
b. I and IV
c. II and IV
The correct statement is: c. II and IV for two proportion testing.
In two proportion testing, the success/failure condition refers to the number of successes and failures in each sample. The condition states that both samples should have a sufficient number of successes and failures for the test to be valid.
II. If one sample passes both parts (has a sufficient number of successes and failures) but the other does not pass either part, it is a violation that needs to be discussed in the conclusion. This is because the sample that does not meet the success/failure condition may affect the validity and reliability of the test results.
IV. If both samples do not pass the success part (do not have a sufficient number of successes) but pass the failure part (have a sufficient number of failures), it is a violation that must be discussed in the conclusion. This violation indicates that the test may not be appropriate for analyzing the proportions in the given samples.
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Show that is a vector space over R.
Please Sir, send the solution as soon as possible.
Thanks in Advance!
Show that V=R^n is a vector space over R
All ten conditions of a vector space are satisfied for V = Rⁿ over R, and therefore it is indeed a vector space over R.
Let V = Rⁿ.
To verify that it is a vector space over R, we need to verify that the following conditions hold:
Closure under vector addition: For any two vectors u and v in V, u + v is also in V. This is easy to see since u and v are each n-dimensional real-valued vectors, and their sum is also an n-dimensional real-valued vector.
Commutativity of vector addition:
For any two vectors u and v in V, u + v = v + u. This follows from the commutativity of addition in R.
Associativity of vector addition:
For any three vectors u, v, and w in V, (u + v) + w = u + (v + w). This follows from the associativity of addition in R.
Identity element for vector addition: There exists a vector 0 in V such that for any vector u in V, u + 0 = u. The zero vector with all n components equal to zero is such an element.
Inverse elements for vector addition: For any vector u in V, there exists a vector -u in V such that u + (-u) = 0.
The additive inverse of the vector u is the vector with each component negated, that is, (-u)i = -ui for i = 1, ..., n.
Closure under scalar multiplication: For any scalar c in R and any vector u in V, cu is also in V. This follows from the fact that each component of cu is obtained by multiplying the corresponding component of u by the scalar c.
Distributivity of scalar multiplication over vector addition: For any scalar c in R and any vectors u and v in V, c(u + v) = cu + cv. This follows from the distributivity of multiplication in R.
Distributivity of scalar multiplication over scalar addition: For any scalars c and d in R and any vector u in V, (c + d)u = cu + du. This also follows from the distributivity of multiplication in R.
Associativity of scalar multiplication: For any scalars c and d in R and any vector u in V, c(du) = (cd)u
This follows from the associativity of multiplication in R.
Identity element for scalar multiplication: For any vector u in V, 1u = u. The scalar 1 acts as the identity element under scalar multiplication.
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Let L = { | M is a Turing machine and L(M) has an infinite
number of even length strings }. Is L decidable (yes/no – 2
points)? Prove it (3 points).
No, L is not decidable. To prove that L is not decidable, it is necessary to use a proof by contradiction. It can be assumed that L is decidable and it needs to be shown that this assumption leads to a contradiction.
A decidable language has a Turing machine that accepts and rejects all strings in a finite amount of time. The property of L that makes it undecidable is that it has an infinite number of even length strings. The contradiction can be shown using the following procedure:
First, let M be a Turing machine that decides L. It can be constructed using the definition of L.
Second, construct a Turing machine S that takes as input the description of another Turing machine T and simulates M on T. If M accepts T, then S enters an infinite loop.
Otherwise, S halts. If S is run on itself, it will either enter an infinite loop or halt. If S halts, then M does not accept S, which means that L(S) does not have an infinite number of even length strings. This is a contradiction. If S enters an infinite loop, then M accepts S, which means that L(S) has an infinite number of even length strings. This is also a contradiction. Therefore, L is not decidable.
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Orange Lake Resort is a major vacation destination near Orlando, Florida, adjacent to the Disney theme parks. Because the property consists of 1,450 acres of land, Orange Lake provides shuttle buses for visitors who need to travel within the resort. Suppose the wait time for a shuttle bus follows the uniform distribution with a minimum time of 30 seconds and a maximum time of 9.0 minutes.
a. What is the probability that a visitor will need to wait more than 3 minutes for the next shuttle?
b. What is the probability that a visitor will need to wait less than 5.5 minutes for the next shuttle?
c. What is the probability that a visitor will need to wait between 4 and 8 minutes for the next shuttle?
d. Calculate the mean and standard deviation for this distribution.
e. Orange Lake has a goal that 80% of the time, the wait for the shuttle will be less than 6 minutes. Is this goal being achieved?
a. The probability that a visitor will need to wait more than 3 minutes for the next shuttle is 0.7.
b. The probability that a visitor will need to wait less than 5.5 minutes for the next shuttle is 0.6111.
c. The probability that a visitor will need to wait between 4 and 8 minutes for the next shuttle is 0.5556.
d. The mean wait time for the shuttle is 4.75 minutes, and the standard deviation is 2.383.
e. No, Orange Lake Resort is not achieving its goal of having 80% of the time wait for the shuttle be less than 6 minutes.
Is Orange Lake Resort achieving its goal for shuttle wait times?In the given scenario, the wait time for a shuttle bus at Orange Lake Resort follows a uniform distribution ranging from 30 seconds to 9.0 minutes. To determine the probabilities and statistical measures, we can use the properties of the uniform distribution.
For part (a), we need to calculate the probability that a visitor will need to wait more than 3 minutes. Since the distribution is uniform, the probability is equal to the ratio of the length of the interval beyond 3 minutes (6 minutes) to the total length of the distribution (8.5 minutes). Therefore, the probability is (9.0 - 3.0) / (9.0 - 0.5) = 0.7.
For part (b), we need to find the probability that a visitor will need to wait less than 5.5 minutes. Again, using the uniform distribution properties, the probability is equal to the ratio of the length of the interval up to 5.5 minutes to the total length of the distribution. Thus, the probability is (5.5 - 0.5) / (9.0 - 0.5) = 0.6111.
For part (c), we are asked to calculate the probability that a visitor will need to wait between 4 and 8 minutes. By subtracting the probabilities of waiting less than 4 minutes (0.4444) and waiting less than 8 minutes (0.8889) from each other, we find the probability is 0.8889 - 0.4444 = 0.5556.
For part (d), to find the mean (expected value) of the distribution, we use the formula (min + max) / 2, which gives us (0.5 + 9.0) / 2 = 4.75 minutes. The standard deviation of a uniform distribution is given by (max - min) / sqrt(12), resulting in (9.0 - 0.5) / sqrt(12) ≈ 2.383 minutes.
Lastly, for part (e), Orange Lake Resort aims to have 80% of the time wait for the shuttle be less than 6 minutes. However, as calculated in part (b), the actual probability of waiting less than 5.5 minutes is 0.6111, which is less than the desired 80%. Therefore, the resort is not achieving its goal for shuttle wait times.
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7. Determine whether each of the following is a linear transformation. Prove/justify your conclusion!
[X1
a. Ta: [x2]
X2
→>>
-3x2
[X1
b. Tb: [X2
x1 +
→>>>
[x2 - 1
We have determined whether Ta and Tb are linear transformations or not. Ta is not a linear transformation, while Tb is a linear transformation.
Ta(x1,x2) = (-3x2)Tb(x1,x2) = (x2 - 1,x1)Let us check if Ta and Tb satisfy the following two conditions for any vectors x and y and a scalar c.
Additivity: T(x + y) = T(x) + T(y)
Homogeneity: T(cx) = cT(x)
Check whether Ta(x + y) = Ta(x) + Ta(y) for any vectors x and y.Ta(x + y) = -3(x2 + y2)Ta(x) + Ta(y) = -3x2 - 3y2= -3x2 - 3y2Therefore, Ta does not satisfy additivity.
Hence it is not a linear transformation.
Ta is not a linear transformation. Tb is a linear transformation.
Summary: We have determined whether Ta and Tb are linear transformations or not. Ta is not a linear transformation, while Tb is a linear transformation.
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The projection matrix is P = A(ATA)-1AT. If A is invertible, what is e? Choose the best answer, e.g., if the answer is 2/4, the best answer is 1/2.
The value of e varies based on A.
Oe-b-Pb
Oe=0
Oe=A7 Ab
The correct answer is: e = 0
Oe - b - Pb: This is an invalid expression as it combines scalar multiplication with subtraction, which is not defined for matrices. Moreover, it doesn't match the form of the projection matrix P.
Oe = 0: This is the correct expression, representing the condition that the projection of vector e onto the subspace defined by matrix A is equal to the zero vector.
Oe = A^T Ab: This expression is not related to the projection matrix. It seems to represent a multiplication between matrices e and A^T followed by a multiplication with vector b, which does not align with the projection matrix formula.
Since we are specifically looking for the value of e, the correct answer is e = 0, as stated in the option "Oe = 0". This means that the projection of e onto the subspace defined by matrix A is the zero vector.
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The correct answer for the given condition is: e = 0
Here, The projection matrix is,
P = A(ATA) - 1AT.
Where, A is invertible,
1) e - b - Pb:
This is an invalid expression as it combines scalar multiplication with subtraction, which is not defined for matrices.
Moreover, it doesn't match the form of the projection matrix P.
2) e = 0:
This is the correct expression, representing the condition that the projection of vector e onto the subspace defined by matrix A is equal to the zero vector.
3) e = A^T Ab:
This expression is not related to the projection matrix. It seems to represent a multiplication between matrices e and A^T followed by a multiplication with vector b, which does not align with the projection matrix formula.
Since we are specifically looking for the value of e, the correct answer is e = 0, as stated in the option "Oe = 0".
This means that the projection of e onto the subspace defined by matrix A is the zero vector.
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3. Let Y₁, ···, Yn denote a random sample from the pdf f(y|a) = { ayª-1/3ª, 0≤ y≤ 3,
0 elsewhere.
Show that E(Y₁) = 3a/(a + 1) and derive the method of moments estimator for a.
To find the expected value of Y₁, we need to calculate the integral of the random variable Y₁ multiplied by the probability density function (pdf) f(y | a) over its support interval.
E(Y₁) = ∫ y f(y | a) dy. Given that the pdf f(y | a) is defined as: f(y | a) = { ay^(a-1)/(3^a), 0 ≤ y ≤ 3,{ 0, elsewhere.We can rewrite the expression for E(Y₁) as: E(Y₁) = ∫ y (ay^(a-1)/(3^a)) dy
= a/3^a ∫ y^a-1 dy (from 0 to 3)
= a/3^a [y^a / a] (from 0 to 3)
= (3^a - 0^a) / 3^a
= 3^a / 3^a
= 1.Therefore, we have E(Y₁) = 1.
To derive the method of moments estimator (MME) for a, we equate the first raw moment of the distribution to the first sample raw moment and solve for a.The first raw moment of the distribution can be calculated as follows: E(Y) = ∫ y f(y|a) dy
= ∫ y (ay^(a-1)/(3^a)) dy
= a/3^a ∫ y^a dy (from 0 to 3)
= a/3^a [y^(a+1) / (a+1)] (from 0 to 3)
= a/3^a [3^(a+1) / (a+1)] - 0
= a/3 * 3^a / (a+1)
= a * (3^a / (3(a+1)))
= 3a / (a+1). Setting E(Y) = M₁, the first sample raw moment, we have: 3a / (a+1) = M₁. Solving for a, we get the method of moments estimator for a: acap = M₁ * (a+1) / 3. Therefore, the MME for a is acap = M₁ * (a+1) / 3.
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1 f(x) = 5(1+x²) g(x) = 11x²2 (a) Use a graphing utility to graph the region bounded by the graphs of the functions. y X - 3 -2 -1 1 2 -2 -1 -0.05- X-0.10 0.15 -0.20 -0.25 -0.30 y 0.30 0.25 0.20 0.1
The graph of the equations is added as an attachment
The solution to the equations are (-0.707, 7.5) and (0.707, 7.5)
Solving the systems of equations graphicallyFrom the question, we have the following parameters that can be used in our computation:
f(x) = 5(1 + x²)
g(x) = 11x² + 2
Next, we plot the graph of the system of the equations
See attachment for the graph
From the graph, we have solution to the system to be the point of intersection of the lines
This points are located at (-0.707, 7.5) and (0.707, 7.5)
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Question
(a) Use a graphing utility to graph the region bounded by the graphs of the functions.
f(x) = 5(1 + x²)
g(x) = 11x² + 2
(b) Determine the solution
: Use undetermined coefficients to find the particular solution to y'' - 2y' 8y = 3 sin (3x) Yp(x) = Now, write the general solution, using C and D for constants. y(x) =
The required general solution is:
y(x) = eˣ(C₁cos 3x + C₂sin 3x) - 1/8 sin(3x) + 3/8 cos(3x),
where C₁ and C₂ are constants.
The given differential equation is y'' - 2y' + 8y = 3 sin (3x)
The characteristic equation is obtained by assuming a solution of the form [tex]y = e^{(rt)[/tex]
Let's solve the characteristic equation to get the homogeneous solution:
r² - 2r + 8 = 0
r = (-b ± √b² - 4ac) / 2a r
= (2 ± √(- 60)) / 2r
= 1 ± 3i
After solving the homogeneous equation, the roots of the characteristic equation are complex.
So the homogeneous solution is given by:
y(x) = eˣ(C₁cos 3x + C₂sin 3x)
The particular solution is obtained using the method of undetermined coefficients.
Let's assume that the particular solution is of the form:
Yp(x) = a sin(3x) + b cos(3x)
We get Yp(x) = - 1/8 sin(3x) + 3/8 cos(3x)
Therefore, the general solution is given by:
y(x) = eˣ(C₁cos 3x + C₂sin 3x) - 1/8 sin(3x) + 3/8 cos(3x)
Hence, the required general solution is:
y(x) = eˣ(C₁cos 3x + C₂sin 3x) - 1/8 sin(3x) + 3/8 cos(3x),
where C1 and C2 are constants.
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Description Write down how do you think "staitistics" is important to you in the future as a civil engineer in 2-3 pages of A4-sized pape
Statistics is crucial for civil engineers as it enables them to analyze and interpret data, make informed decisions, and ensure the safety and efficiency of their projects.
Statistics plays a pivotal role in the field of civil engineering, providing engineers with the tools and techniques to analyze data, draw meaningful conclusions, and make informed decisions. The following are some key ways in which statistics is important to a civil engineer:
Data Analysis and Interpretation: Civil engineers often deal with large amounts of data related to materials, environmental conditions, and structural behavior. By applying statistical methods, they can analyze this data to identify patterns, trends, and correlations. This helps in understanding the behavior of materials, predicting potential failures, and designing structures to withstand various loads and environmental conditions.
Risk Assessment and Mitigation: Statistics enables civil engineers to assess and manage risks associated with infrastructure projects. They can use probability distributions and statistical models to estimate the likelihood of failures, accidents, or natural disasters. By quantifying these risks, engineers can develop strategies to mitigate them, ensuring the safety of structures and the people who use them.
Optimization and Design: Statistics plays a vital role in optimizing designs and achieving cost-effective solutions. Through statistical analysis, civil engineers can identify the most influential factors affecting a design and optimize them accordingly. This helps in minimizing material usage, reducing construction costs, and improving the overall efficiency of the project.
Cost Estimation: Accurate cost estimation is essential for the successful execution of civil engineering projects. Statistics helps engineers in estimating costs by analyzing historical data, identifying cost drivers, and developing reliable cost models. This enables them to provide accurate cost projections, manage budgets effectively, and avoid cost overruns.
Performance Evaluation: Statistics allows civil engineers to evaluate the performance of structures and infrastructure systems. By analyzing data from sensors, monitoring systems, and inspections, engineers can assess the structural health, identify signs of deterioration, and plan maintenance and repair activities. This proactive approach helps in ensuring the longevity and sustainability of infrastructure.
Quality Control: Statistics plays a crucial role in quality control during construction. Engineers can use statistical methods to monitor and control the quality of construction materials, ensuring they meet the required standards. Statistical process control techniques can also be employed to monitor construction processes, identify deviations, and take corrective actions to maintain quality throughout the project.
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The count in a bacteria culture was 700 after 10 minutes and 1600 after 30 minutes. Assuming the count grows exponentially (show your work to three decimal places):
1. What was the initial size of the culture?
2. Find the doubling period
3. Find the population after 110 minutes
4. When will the population reach 10,000
Initial size of bacteria culture can be determined by using exponential growth formula, given by: [tex]P = P0. e^{(kt)[/tex], where P is the population at time t, P0 is the initial population size, k is the growth rate constant.
To find the initial size of the culture, we can use the given information for the first data point (10 minutes). Let's plug in the values into the formula:
700 = [tex]P0 .e^{(k. 10)[/tex]
To solve for P0, we need to know the growth rate constant, k. Let's rearrange the formula:
[tex]e^{(k . 10)[/tex] = 700 / P0
Taking the natural logarithm of both sides:
k .10 = ln(700 / P0)
Now, we can solve for P0:
P0 = 700 / [tex]e^{(k. 10)[/tex]
2. The doubling period can be calculated using the growth rate constant, k. The doubling period is the time it takes for the population to double in size. It can be found using the formula: Td = ln(2) / k, where Td is the doubling period.
3. To find the population after 110 minutes, we can use the exponential growth formula again. Let's plug in the values:
[tex]P = P0. e^{(k. t)}\\P = P0. e^{(k. 110)}[/tex]
4. To determine when the population will reach 10,000, we can use the exponential growth formula. Let's plug in the values and solve for the time, t:
10,000 = [tex]P0. e^{(k. t)[/tex]
Now we can rearrange the formula to solve for t:
t = (ln(10,000 / P0)) / k
Using the growth rate constant, k, obtained from the previous calculations, we can substitute it into the formula to find the time when the population will reach 10,000.
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There are some questions that have functions with discrete-valued domains (such as day, month, year, etc). For simplicity, we treat them as continuous functions.
• For NAT type question, enter only one right answer even if you get multiple answers for that particular question. • R= Set of real numbers
Q= Set of rational numbers
• Z= Set of integers
N= Set of natural numbers
The set of natural numbers includes 0.
1) Lily and Rita resides at two different locations. They decided to meet some day. Lily and Rita cycled along the roads represented by r1: y = x + 1 and r2 : 3x + y -50 respectively. Find the equation of the straight road (3) that passes through the meeting point of Lily and Rita and is perpendicular to any one of the roads 1 or 2.
1 point
r3x-3y+5=0
r3: 2x+2y=6
□ r3x+y-3=0
r3: 2xy=0
Correct option is: r3: y - y_m = -(x - x_m) .To find the equation of the straight road that passes through the meeting point of Lily and Rita and is perpendicular to either road r1: y = x + 1 or r2: 3x + y - 50, we can use the fact that the product of the slopes of two perpendicular lines is -1.
1. Road r1: y = x + 1
The slope of road r1 is 1 (since it is in the form y = mx + b, where m is the slope). Therefore, the slope of the line perpendicular to r1 is -1/1 = -1.
2. Road r2: 3x + y - 50 = 0
To find the slope of r2, we can rewrite the equation in slope-intercept form: y = -3x + 50. The slope of road r2 is -3. Therefore, the slope of the line perpendicular to r2 is 1/3.
Now, we have two slopes, -1 and 1/3. Let's find the equation of the line passing through the meeting point and having one of these slopes.
Using point-slope form:
For slope -1 (perpendicular to r1), we can use the meeting point coordinates (x_m, y_m) and the slope -1 to find the equation:
y - y_m = -1(x - x_m)
Substituting the meeting point coordinates, the equation becomes:
y - y_m = -(x - x_m)
For slope 1/3 (perpendicular to r2), we can use the meeting point coordinates (x_m, y_m) and the slope 1/3 to find the equation:
y - y_m = (1/3)(x - x_m)
Therefore, the equation of the straight road that passes through the meeting point of Lily and Rita and is perpendicular to either r1 or r2 is:
r3: y - y_m = -(x - x_m) or r3: y - y_m = (1/3)(x - x_m)
In the given answer choices: - r3: x - 3y + 5 = 0 and r3: 2x + 2y = 6 are not equations of lines perpendicular to r1 or r2.
- r3: x + y - 3 = 0 is not an equation of a straight line.
Therefore, the correct option is: r3: y - y_m = -(x - x_m)
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1.) Let f(x) = x + cos x and let y = f-1(x). Find the derivative of y with respect to x in terms of x and y.
2.) Write out the form of the partial fraction decomposition of the function: x2 + 1 / (x2+2)2x3(x2-9)
Let's find the derivative of y with respect to x, denoted as dy/dx.
Given that y = f^(-1)(x), we can express this relationship as f(y) = x.
Starting with the equation f(x) = x + cos(x), we need to solve it for x in terms of y.
x + cos(x) = f(y)
Now, we need to differentiate both sides of the equation with respect to x.
d/dx(x + cos(x)) = d/dx(f(y))
1 - sin(x) = dy/dx
Since f(y) = x, we can substitute y back into the equation.
1 - sin(x) = dy/dx
Therefore, the derivative of y with respect to x is given by dy/dx = 1 - sin(x).
To find the partial fraction decomposition of the function (x^2 + 1) / [(x^2 + 2)^2 * x^3 * (x^2 - 9)], we need to factor the denominator first.
(x^2 + 1) / [(x^2 + 2)^2 * x^3 * (x^2 - 9)]
= (x^2 + 1) / [(x + √2)^2 * (x - √2)^2 * x^3 * (x + 3) * (x - 3)]
The denominator contains repeated linear and quadratic factors, so the partial fraction decomposition will involve terms with constants in the numerators.
The general form of the partial fraction decomposition for this expression is:
(x^2 + 1) / [(x + √2)^2 * (x - √2)^2 * x^3 * (x + 3) * (x - 3)] = A / (x + √2) + B / (x - √2) + C / (x + √2)^2 + D / (x - √2)^2 + E / x + F / x^2 + G / x^3 + H / (x + 3) + I / (x - 3)
Here, A, B, C, D, E, F, G, H, and I are constants that we need to determine. To find the values of these constants, we need to multiply both sides of the equation by the denominator and equate the corresponding coefficients.
Note: It is important to perform the algebraic manipulations and solve for the constants, but the process can be quite involved and tedious. Therefore, I will not provide the complete solution here.
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Write the equation in standard form for the circle with center (8, – 1) and radius 3 10.
Step-by-step explanation:
Standard form of circle with center (h,k) and radius r is
(x-h)^2 + (y-k)^2 = r^2
for this circle, this becomes
(x-8)^2 + (y+1)^2 = 310^2
dy 10: For the equation, use implicit differentiation to find dy / dx and evaluate it at the given numbers. x² + y² = xy +7 at x = -3. y = -2.
Using implicit differentiation, the derivative dy/dx of the equation x² + y² = xy + 7 is found to be dy/dx = (y - x) / (y - 2x). Evaluating this at x = -3 and y = -2, we get dy/dx = 5/4.
To find dy/dx, we differentiate both sides of the equation x² + y² = xy + 7 with respect to x using the rules of implicit differentiation.
Differentiating x² + y² with respect to x gives 2x + 2yy' (using the chain rule), and differentiating xy + 7 with respect to x gives y + xy'.
Rearranging the terms, we have:
2x + 2yy' = y + xy'
Bringing the y' terms to one side and factoring out y - x, we get:
2x - y = (y - x)y'
Dividing both sides by y - x, we have:
y' = (2x - y) / (y - x)
Substituting x = -3 and y = -2 into the derivative expression, we get:
dy/dx = (y - x) / (y - 2x) = (-2 - (-3)) / (-2 - 2(-3)) = 5/4
Therefore, dy/dx evaluated at x = -3 and y = -2 is dy/dx = 5/4.
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3. (2 pt) Find the kernel of the linear transformation L : R³ → R³ with matrix 25 1 39 0 14
The kernel of a linear transformation is defined as the subspace of the domain where the transformation is equal to the zero vector. Mathematically, ker (L) = {x ∈ V : L (x) = 0} where V is the vector space of the domain.
Now, let us find the kernel of the linear transformation L : R³ → R³ with matrix [25, 1, 39; 0, 14, 0; 0, 0, 0].
Let L be a linear transformation from R³ → R³ with matrix A, then L (x) = Ax for all x in R³.
Let x = [x₁ x₂ x₃] be an arbitrary vector in R³.
Then L (x) = [25 1 39; 0 14 0; 0 0 0] [x₁; x₂; x₃]
= [25x₁ + x₂ + 39x₃; 0; 0]
The kernel of L is the set of all vectors in R³ that maps to the zero vector in R³. Therefore,
ker (L) = {[x₁ x₂ x₃] ∈ R³ : L ([x₁ x₂ x₃]) = 0}
Let us solve L (x) = 0. That is, [25x₁ + x₂ + 39x₃; 0; 0]
= [0; 0; 0]
⇒ 25x₁ + x₂ + 39x₃ = 0
⇒ x₁ = (-1/25)(x₂ + 39x₃)
It follows that
ker (L) = {x ∈ R³ : L (x) = 0}
= {[(-1/25)(x₂ + 39x₃) x₂ x₃] : x₂, x₃ ∈ R}
= {[-x₂/25 - 39x₃/25 x₂ x₃] : x₂, x₃ ∈ R}
Therefore, ker (L) = span{[-1/25 1 0], [-39/25 0 1]}
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