The data suggests that training with method 1 leads to a significantly lower mean job time compared to training with method 2.
Is there a significant difference in mean job time between training with method 1 and method 2?The data suggests that training with method 1 leads to a significantly lower mean job time compared to training with method 2.
Based on the data obtained from the experiment, where 10 workers were trained using both programs, it is possible to draw conclusions about the effectiveness of the training methods. The experiment employed a crossover design, where 5 workers were trained with method 1 first and then method 2, while the other 5 workers were trained with method 2 first and then method 1. After each training, the workers underwent a time-and-motion test to measure the speed of their performance in a skilled job.
The analysis of the data indicates that the mean job time is significantly lower after training with method 1 compared to method 2. This conclusion can be drawn by conducting appropriate statistical tests, such as a paired t-test or a repeated measures analysis of variance (ANOVA), to assess the significance of the observed differences in mean job time between the two training methods.
To further validate the findings and ensure the reliability of the conclusion, it is important to consider factors such as the specific nature of the skilled job being performed, the qualifications and prior experience of the workers, and the potential limitations of the experiment. These factors could influence the generalizability of the results to other contexts or populations.
Furthermore, it is crucial to evaluate the training methods themselves, including their content, delivery format, and duration, to identify potential reasons for the observed differences in mean job time. Understanding the specific aspects of method 1 that contribute to its effectiveness can provide valuable insights for optimizing industrial worker training programs and improving overall productivity.
In summary, the data from the experiment suggest that training with method 1 leads to a significantly lower mean job time compared to training with method 2. However, further research and analysis are necessary to confirm these findings, consider relevant factors, and gain a comprehensive understanding of the underlying mechanisms driving the observed results.
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Use the results from a survey of a simple random sample of 1272 adults. Among the 1272 respondents, 63% rated themselves as above average drivers. We want to test the claim that 3/5 of adults rate themselves as above average drivers. Complete parts (a) through (c).
A. Identify the actual number of respondents who rated them selves above average drivers.
B Identify the sample proportion and use the symbol that represents it
C. For the hypothesis test, identify the value used for the population proportion and use the symbol that represents it.
A. The actual number of respondents can be found by multiplying the total number of respondents (1272) by the proportion who rated themselves as above average drivers (63%).
Actual number of respondents who rated themselves as above average drivers = 1272 * 0.63 = 800.16 (approximately) Since we cannot have a fractional number of respondents, the actual number of respondents who rated themselves as above average drivers would be 800. B. The sample proportion represents the proportion of respondents in the sample who rated themselves as above average drivers. It is denoted by the symbol "phat" (pronounced p-hat).
C. For the hypothesis test, the value used for the population proportion is the claimed proportion of adults who rate themselves as above average drivers. In this case, the claimed proportion is 3/5, which can be written as 0.6. The symbol representing the population proportion is "p".
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If the density of gasoline is approximately 6 pounds per gallon, approximately what is the density of gasoline in grams per cubic centimeter? (Note: 1 gallon= 3,785.4 cubic centimeters and 1 kilogram= 2.2 pounds, both to the nearest 0.1.) 0.003 0.72 3.5 10,323 49,962
To convert the density of gasoline from pounds per gallon to grams per cubic centimeter, we need to perform the following conversions:
1 pound = 0.4536 kilograms (to the nearest 0.1)
1 gallon = 3,785.4 cubic centimeters (to the nearest 0.1)
First, let's convert pounds to kilograms:
6 pounds * 0.4536 kilograms/pound = 2.7216 kilograms (approximately, rounded to the nearest 0.1)
Next, let's convert gallons to cubic centimeters:
1 gallon = 3,785.4 cubic centimeters
Now, we can calculate the density of gasoline in grams per cubic centimeter:
Density = (Mass in grams) / (Volume in cubic centimeters)
Density = (2.7216 kilograms * 1000 grams/kilogram) / (3,785.4 cubic centimeters)
Density ≈ 0.718 grams per cubic centimeter (approximately, rounded to the nearest 0.1)
Therefore, the density of gasoline in grams per cubic centimeter is approximately 0.72 grams per cubic centimeter.
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Let X and Y be two independent random variables such that Var (3X-Y)=12 and Var (X+2Y)=13. Find Var (X) and Var (Y).
To find the variances of X and Y, we'll use the properties of variance and the fact that X and Y are independent random variables.
Given:
Var(3X - Y) = 12 ...(1)
Var(X + 2Y) = 13 ...(2)
We know that for any constants a and b:
Var(aX + bY) = a²Var(X) + b²Var(Y) + 2abCov(X, Y)
Since X and Y are independent, Cov(X, Y) = 0.
Using this property, let's solve for Var(X) and Var(Y).
From equation (1):
Var(3X - Y) = 12
9Var(X) + Var(Y) - 6Cov(X, Y) = 12 ...(3)
From equation (2):
Var(X + 2Y) = 13
Var(X) + 4Var(Y) + 4Cov(X, Y) = 13 ...(4)
Since Cov(X, Y) = 0 (because X and Y are independent), equation (4) simplifies to:
Var(X) + 4Var(Y) = 13 ...(5)
Now, we can solve the system of equations (3) and (5) to find Var(X) and Var(Y).
Substituting the value of Var(Y) from equation (5) into equation (3), we get:
9Var(X) + (13 - Var(X))/4 - 0 = 12
36Var(X) + 13 - Var(X) = 48
35Var(X) = 35
Var(X) = 1
Substituting Var(X) = 1 into equation (5), we get:
Var(X) + 4Var(Y) = 13
1 + 4Var(Y) = 13
4Var(Y) = 12
Var(Y) = 3
Therefore, Var(X) = 1 and Var(Y) = 3.
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*differential equations* *will like if work is shown correctly and
promptly
11. Given the equation y" - y' - 6y = 0, y = 1, y'(0) = 2,Y(s) is: S-1 S+3 d. (5-3)(s+2) (5-3)(s+2) a. 1 5+1 b. 5+2 e. (s-3)(s+2) c. S 1 + S-3 S+2
Taking the inverse Laplace transform of Y(s), we get y(t) = 1 + e^(3t) / 3 - e^(-2t) Therefore, the answer is option (c) S1 + S-3 / S + 2.
Given the differential equation:
y" - y' - 6y = 0 and
the initial conditions: y = 1, y'(0) = 2
Taking the Laplace transform of the differential equation, we get
(s^2Y - sy(0) - y'(0)) - (sY - y(0)) - 6Y
= 0s^2Y - s(1) - 2 - sY + 1 - 6Y
= 0s^2Y - sY - 6Y
= 1 + 2 - 1s^2Y - sY - 6Y
= 2 ... (1)
Also, from the initial condition, we know
Y(0) = 1 ... (2)
Y'(0) = 2
Taking the Laplace transform of the initial conditions, we gets
Y = 1/s ... (3)
sY - y(0) = 2
sY - 1 = 2
Therefore, from equation (1) and (3), we get:s^2Y - sY - 6Y = 2 ... (1)
2Y(s) = Y(s)(2 - s) / (s^2 - s - 6)
= Y(s)(2 - s) / (s - 3)(s + 2)
Y(s) = 1 / s + A / (s - 3) + B / (s + 2) where A and B are constants.
We can determine the values of A and B by equating coefficients.
1 = A(s + 2) + B(s - 3)
Putting s = -2, we get
1 = -5B
A = -1/5
Putting s = 3, we get
1 = 5A2
= A + 15BA = 1, B = 1
Therefore, Y(s) = 1 / s - 1 / (s - 3) + 1 / (s + 2)
Taking the inverse Laplace transform of Y(s), we get
y(t) = 1 + e^(3t) / 3 - e^(-2t)
Therefore, the answer is option (c) S1 + S-3 / S + 2.
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If there are outliers in a sample, which of the following is always true?a. Mean > Median
b. Standard deviation is smaller than expected (smaller than if there were no outliers)
c. Mean < Median
d. Standard deviation is larger than expected (larger than if there were no outliers)
In the presence of outliers in a sample, the statement that is always true is d. Standard deviation is larger than expected (larger than if there were no outliers).
Outliers are extreme values that are significantly different from the other data points in a sample. These extreme values have a greater impact on the standard deviation compared to the mean or median. As a result, the standard deviation increases when outliers are present. Therefore, option d is the correct answer.
To summarize, when outliers are present in a sample, the standard deviation is typically larger than expected, while the relationship between the mean and median can vary and is not always predictable.
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1.2 (3 points) Let A be a square matrix such that A3 = A. Find all eigenvalues of A.
Answer
1.5 (3 points) Let p = a + a1x + a2x2 and q = b。 + b1x + b2x2 be any two vectors in P2 and defines an inner product on P2:
(p,q) = aobo + a1b1 + a2b2
Find the cosine of the angle between p = -2x + 3x2 and q = 1 + x − x2.
Answer
A square matrix A is said to be an eigenvector of a square matrix A if [tex]Ax = λx,[/tex] where x is a non-zero column vector and λ is a scalar. A matrix can have one or more eigenvalues .[tex]λ[/tex]is an eigenvalue of A if and only if there exists a non-zero x in Rn such that [tex]Ax = λx. (A − λI)x[/tex]
= 0.
This equation is only solvable if [tex]det(A − λI) = 0,[/tex] where I is the identity matrix, which gives the characteristic equation of A.
Let A be a square matrix such that A3 = A. Find all eigenvalues of A.
Step by step answer:
A3 = A
⇒ A(A2 − I)
= 0.
Let λ be an eigenvalue of A, and x a non-zero eigenvector. We may suppose that [tex]Ax = λx[/tex]
⇒ A2x
[tex]= λAx[/tex]
[tex]= λ2x.[/tex]
Now if[tex]λ = 0,[/tex]
then A2x = 0,
and so Ax = 0.
Thus 0 is not an eigenvalue. If[tex]λ≠0,[/tex]then x = A2x
= λAx
= λ2x.
Then[tex]λ2 = 1[/tex]
or[tex]λ2 = -1[/tex]
since A2 = I.
Thus the eigenvalues of A are 1, −1, 0.Calculation of Cosine of the angle between [tex]p = -2x + 3x2[/tex]
and [tex]q = 1 + x − x2.[/tex]
We can determine the cosine of the angle between two vectors using the inner product, as follows:
[tex]cosθ = (p,q) / √((p,p)(q,q))[/tex]
Let p = -2x + 3x2
and q = 1 + x − x2.
So,[tex](p,q) = (-2)(1) + (3)(1) + (0)(-1)[/tex]
[tex]= 1, (p,p)[/tex]
[tex]= 4 + 9 = 13, and (q,q)[/tex]
[tex]= 1 + 1 + 1 = 3.cosθ[/tex]
[tex]= (p,q) / √((p,p)(q,q))[/tex]
[tex]= 1 / √(13 × 3) = 1 / √39[/tex]
The cosine of the angle between[tex]p = -2x + 3x2[/tex] and
[tex]q = 1 + x − x2 is 1 / √39.[/tex]
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Find fog and gof. f(x) = 1/x, g(x) = x + 8 (a) fog ___
(b) gof ___
Find the domain of each function and each composite function. (Enter your answers using interval notation.) domain of f ____
domain of g ____
domain of f o g ____
domain of g o f ____
To find [tex]\(f \circ g\) (fog),[/tex] we substitute the function [tex]\(g(x)\)[/tex] into the function [tex]\(f(x)\):[/tex]
[tex]\(f \circ g(x) = f(g(x))\)[/tex]
Given [tex]\(f(x) = \frac{1}{x}\) and \(g(x) = x + 8\),[/tex] we can substitute [tex]\(g(x)\)[/tex]into [tex]\(f(x)\):[/tex]
[tex]\(f \circ g(x) = f(g(x)) = f(x + 8) = \frac{1}{x + 8}\)[/tex]
Therefore, [tex](f \circ g(x) = \frac{1}{x + 8}\).[/tex]
To find [tex]\(g \circ f\) (gof)[/tex], we substitute the function [tex]\(f(x)\)[/tex] into the function [tex]\(g(x)\):[/tex]
[tex]\(g \circ f(x) = g(f(x))\)[/tex]
Given [tex]\(f(x) = \frac{1}{x}\) and \(g(x) = x + 8\)[/tex], we can substitute [tex]\(f(x)\) into \(g(x)\):[/tex]
[tex]\(g \circ f(x) = g(f(x)) = g\left(\frac{1}{x}\right) = \frac{1}{x} + 8\)[/tex]
Therefore, [tex]\(g \circ f(x) = \frac{1}{x} + 8\).[/tex]
Now let's determine the domain of each function and each composite function:
The domain of [tex]\(f(x) = \frac{1}{x}\)[/tex] is all real numbers except [tex]\(x = 0\)[/tex] since division by zero is undefined.
The domain of [tex]\(g(x) = x + 8\)[/tex] is all real numbers since there are no restrictions on [tex]\(x\).[/tex]
To find the domain of [tex]\(f \circ g\),[/tex] we need to consider the domain of [tex]\(g(x)\)[/tex] and its effect on the domain of [tex]\(f(x)\). Since \(g(x) = x + 8\)[/tex] has no restrictions on its domain, the domain of [tex]\(f \circ g\)[/tex]will be the same as the domain of [tex]\(f(x) = \frac{1}{x}\)[/tex], which is all real numbers except[tex]\(x = 0\).[/tex]
To find the domain of [tex]\(g \circ f\),[/tex] we need to consider the domain of [tex]\(f(x)\)[/tex] and its effect on the domain of [tex]\(g(x)\). Since \(f(x) = \frac{1}{x}\)[/tex] is undefined at [tex]\(x = 0\), the domain of \(g \circ f\)[/tex] will exclude [tex]\(x = 0\)[/tex], but include all other real numbers.
In interval notation:
Domain of [tex]\(f\) is \((- \infty, 0) \cup (0, \infty)\)[/tex]
Domain of [tex]\(g\) is \((- \infty, \infty)\)[/tex]
Domain of [tex]\(f \circ g\) is \((- \infty, 0) \cup (0, \infty)\)[/tex]
Domain of [tex]\(g \circ f\) is \((- \infty, 0)[/tex] [tex]\cup (0, \infty)\)[/tex] To find [tex]\(f \circ g\) (fog)[/tex], we substitute the function [tex]\(g(x)\)[/tex] into the function [tex]\(f(x)\):[/tex]
[tex]\(f \circ g(x) = f(g(x))\)[/tex]
Given [tex]\(f(x) = \frac{1}{x}\) and \(g(x) = x + 8\), we can substitute \(g(x)\) into \(f(x)\):[/tex]
[tex]\(f \circ g(x) = f(g(x)) = f(x + 8) = \frac{1}{x + 8}\)[/tex]
Therefore, [tex]\(f \circ g(x) = \frac{1}{x + 8}\).[/tex]
To find [tex]\(g \circ f\) (gof), we substitute the function \(f(x)\) into the function \(g(x)\):[/tex]
[tex]\(g \circ f(x) = g(f(x))\)[/tex]
Given [tex]\(f(x) = \frac{1}{x}\) and \(g(x) = x + 8\), we can substitute \(f(x)\) into \(g(x)\):[/tex]
[tex]\(g \circ f(x) = g(f(x)) = g\left(\frac{1}{x}\right) = \frac{1}{x} + 8\)[/tex]
Therefore, [tex]\(g \circ f(x) = \frac{1}{x} + 8\).[/tex]
Now let's determine the domain of each function and each composite function:
The domain of [tex]\(f(x) = \frac{1}{x}\)[/tex] is all real numbers except [tex]\(x = 0\)[/tex] since division by zero is undefined.
The domain of [tex]\(g(x) = x + 8\)[/tex] is all real numbers since there are no restrictions on [tex]\(x\).[/tex]
To find the domain of [tex]\(f \circ g\)[/tex], we need to consider the domain of [tex]\(g(x)\)[/tex]and its effect on the domain of [tex]\(f(x)\).[/tex] Since [tex]\(g(x) = x + 8\)[/tex] has no restrictions on its domain, the domain of [tex]\(f \circ g\)[/tex] will be the same as the domain of [tex]\(f(x) = \frac{1}{x}\),[/tex] which is all real numbers except [tex]\(x = 0\).[/tex]
To find the domain of [tex]\(g \circ f\)[/tex], we need to consider the domain of [tex]\(f(x)\)[/tex] and its effect on the domain of [tex]\(g(x)\)[/tex]. Since [tex]\(f(x) = \frac{1}{x}\)[/tex]is undefined at [tex]\(x = 0\),[/tex] the domain of [tex]\(g \circ f\)[/tex] will exclude [tex]\(x = 0\),[/tex] but include all other real numbers.
In interval notation:
Domain of [tex]\(f\) is \((- \infty, 0) \cup (0, \infty)\)[/tex]
Domain of [tex]\(g\) is \((- \infty, \infty)\)[/tex]
Domain of [tex]\(f \circ g\) is \((- \infty, 0) \cup (0, \infty)\)[/tex]
Domain of [tex]\(g \circ f\) is \((- \infty, 0) \cup (0, \infty)\)[/tex]
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Find rand O
for the
and C for complex numbers:
(a) Z1 =
(り
2_21
2+2i
(b) Z2 =-5i
את
72
まろ
3
-5-5
following
a) Let us begin by expressing Z1 in the form a + bi where a and b are real numbers. Here's the process:
[tex]\[Z_1 = \frac{2 - 21i}{(2 + 2i)Z_1}\]\[Z_1 = \frac{(2 - 21i)(2 - 2i)}{(2 + 2i)(2 - 2i)Z_1}\]\[Z_1 = \frac{4 - 42i - 4i - 42i^2}{4 + 4i - 4i - 4i^2}Z_1\]\[Z_1 = \frac{4 - 46i + 42}{4 + 4}Z_1\]\[Z_1 = \frac{46}{8} - \frac{i}{2}Z_1\]\[Z_1 = \frac{23}{4} - \frac{i}{2}\][/tex]
Now, let us find its absolute value:
[tex]\[|Z_1| = \sqrt{\left(\frac{23}{4}\right)^2 + \left(\frac{-1}{2}\right)^2|Z_1|}\][/tex]
[tex]\[= \sqrt{\frac{529}{16} + \frac{1}{4}|Z_1|}\][/tex]
[tex]\[= \sqrt{\frac{132.25}{16}|Z_1|}\][/tex]
= 3.25So, rand O for Z1 is 3.25. b) First, let us express Z2 in the form
a + bi where a and b are real numbers.
Here's the process:
[tex]\begin{equation}Z^2 = -5i \div \left(\left(72\right)^{\frac{1}{3}}\right)Z^2\end{equation}[/tex]
[tex]\begin{equation}Z^2 = -5i \div 4.30886938Z^2\end{equation}[/tex]
[tex]\begin{equation}Z^2 = \frac{-5}{4.30886938}i\end{equation}[/tex]
Therefore,
[tex]\begin{equation}Z^2 = -1.157622876i\end{equation}[/tex]
Now, let us find its absolute value:
[tex]\begin{equation}\left|Z^2\right| = \sqrt{0^2 + (-1.157622876)^2}\left|Z^2\right|\end{equation}[/tex]
= 1.157622876
Therefore, rand O for Z2 is 1.157622876.C for complex numbers is the set of all complex numbers.
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Find an equation of the plane passing through the three points given P = (5, 6, 6), Q = (6, 10, 16), R = (14, 12, 7) (Use symbolic notation and fractions where needed. Give you answer in the form ax + by + cz = d.)
To find an equation of the plane passing through the three given points P, Q, and R, we can use the concept of cross products. By finding the vectors formed by two sides of the plane, we can calculate the normal vector, which will provide the coefficients of the equation of the plane in the form ax + by + cz = d.
Let's start by finding two vectors in the plane. We can take vectors formed by the points P and Q, and P and R, respectively. The vector formed by P and Q is given by v1 = Q - P = (6 - 5, 10 - 6, 16 - 6) = (1, 4, 10). The vector formed by P and R is given by v2 = R - P = (14 - 5, 12 - 6, 7 - 6) = (9, 6, 1).
Next, we calculate the cross product of v1 and v2 to obtain the normal vector of the plane. The cross product is given by n = v1 × v2 = (4*1 - 10*6, 10*9 - 1*1, 1*6 - 4*9) = (-56, 89, -30).
Now that we have the normal vector, we can write the equation of the plane using the point-normal form. Substituting the values from P into the equation, we have -56(x - 5) + 89(y - 6) - 30(z - 6) = 0. Simplifying further, we get -56x + 280 + 89y - 534 - 30z + 180 = 0. Combining like terms, we obtain -56x + 89y - 30z = 74.
Therefore, the equation of the plane passing through the points P, Q, and R is -56x + 89y - 30z = 74.
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(a) By making appropriate use of Jordan's lemma, find the Fourier transform of f(x) = (x² + 1)² (b) Find the Fourier-sine transform (assume k ≥ 0) for 1 = 2+2³ (2) (2)
(a) The Fourier transform of f(x) = (x² + 1)² is √(2π) exp(-2πk) / √2.
The application of Jordan's lemma is quite appropriate to find the Fourier transform of f(x) = (x² + 1)². (b) The Fourier-sine transform (assume k ≥ 0) for 1 = 2+2³ (2) (2) is 8√2 / (πk(4+k²)). Part a: The Fourier transform of f(x) = (x² + 1)² is √(2π) exp(-2πk) / √2, where exp(-2πk) represents the exponential decay of the Fourier transform in the time domain. The application of Jordan's lemma is quite appropriate in evaluating the integral for the Fourier transform. In applying Jordan's lemma, the following conditions are satisfied: i) The function f(x) is continuous and piecewise smooth .ii) The integral evaluated using the Jordan's lemma converges as k approaches infinity. iii) The complex function f(z) is analytic in the upper half-plane and approaches zero as |z| approaches infinity. The integral expression is evaluated using the residue theorem. Part b: The Fourier-sine transform (assume k ≥ 0) for 1 = 2+2³ (2) (2) is 8√2 / (πk(4+k²)). Using the definition of the Fourier-sine transform and partial fraction decomposition, the Fourier-sine transform can be evaluated. The Fourier-sine transform is used to transform a function defined on the half-line (0,∞) into a function defined on the half-line (0,∞).
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4. [27] a) Using the definition of the matrix exponential, calculate eAt for A = [J]
Matrix exponential of a matrix A is defined as e^A = ∑_{k=0}^{∞} (A^k / k!)
Given the matrix A = [J].a) Using the definition of the matrix exponential, calculate e^AtMatrix Exponential is defined as
e^A = ∑_{k=0}^{∞} (A^k / k!),
where k! represents k-factorial.
Summary: Matrix exponential of a matrix A is defined as e^A = ∑_{k=0}^{∞} (A^k / k!). For A = [J], the matrix A is of dimension 2x2. We can find e^A by computing the matrix exponential of I using the formulae that we derived above. The answer is e^A = {e,0;0,e}.
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Write detailed answers and submit in LEB2. Find the volume of the object in the first octant bounded below by = √x² + y² and above by ² + y² + ² = 2.
Hint: Use the substitution (the spherical coordinate system):
x = p sin ó cos 0; y p sin o sin 0; = = p cos o. Ps. Fill the word "A" in the blanks for moving to the next question.
To find the volume of the object in the first octant bounded below by z = √(x² + y²) and above by z² + y² + z² = 2, we'll use the given hint and make a substitution to convert to spherical coordinates.
Let's start by making the substitution:
x = p sin(θ) cos(φ)
y = p sin(θ) sin(φ)
z = p cos(θ)
Here, p represents the radial distance from the origin to the point, θ is the angle between the positive z-axis and the line connecting the origin to the point, and φ is the angle between the positive x-axis and the projection of the line connecting the origin to the point onto the xy-plane.
Now, we need to determine the limits of integration for p, θ, and φ in order to define the volume in spherical coordinates.
Limits for p:
Since the object is bounded below by z = √(x² + y²),
we can rewrite it as z = p cos(θ) = √(p² sin²(θ) cos²(φ) + p² sin²(θ) sin²(φ)).
Simplifying the equation, we have p cos(θ) = p sin(θ) and taking the square of both sides, we get cos²(θ) = sin²(θ).
Using the identity sin²(θ) + cos²(θ) = 1, we have 1 - cos²(θ) = cos²(θ), which gives 2cos²(θ) = 1.
Solving for cos(θ), we find cos(θ) = ±1/√2.
Since we're working in the first octant, we can take the positive value: cos(θ) = 1/√2.
Therefore, the limits for p are from 0 to 1/√2.
Limits for θ:
The angle θ ranges from 0 to π/2 because we're considering the first octant.
Limits for φ:
The angle φ ranges from 0 to π/2 because we're working in the first octant.
Now, we can set up the integral to calculate the volume V:
V = ∫∫∫ρ² sin(θ) dρ dθ dφ
Integrating with the given limits, we have:
V = ∫[0,π/2] ∫[0,π/2] ∫[0,1/√2] ρ² sin(θ) dρ dθ dφ
Evaluating this integral will yield the volume of the object in the first octant bounded by the given surfaces.
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a. Prove or Disprove each of the following. [a-i] The group Z₂ x Z3 is cyclic. [a-ii] If (ab)² = a²b² for all a, b e G, then G is an abelian group. [a-iii] {a+b√2 a, b e Q-{0}} is a normal subgroup of C-{0} with usual multiplication as a binary operation.
a-i) The group Z₂ x Z₃ is not cyclic.a-ii) The statement is true. If (ab)² = a²b² for all a, b in group G, then G is an abelian group.a-iii) The statement is false.
a-i) In Z₂ x Z₃, every element has finite order, and there is no single element that can generate the entire group. The elements of Z₂ x Z₃ are (0, 0), (0, 1), (0, 2), (1, 0), (1, 1), and (1, 2), and none of them generate the entire group when multiplied repeatedly. a-ii) If (ab)² = a²b² for all a, b in group G, then G is an abelian group. To prove this, consider (ab)² = a²b². Simplifying this equation, we get abab = aabb. Cancelling the common factors, we have ab = ba, which shows that G is commutative. Hence, G is an abelian group.
a-iii) The set {a + b√2 | a, b ∈ Q-{0}} is not a normal subgroup of C-{0} under the usual multiplication operation. For a subgroup to be normal, it needs to satisfy the condition that for any element g in the group and any element h in the subgroup, the product ghg^(-1) should also be in the subgroup. However, if we take g = 1 + √2 and h = √2, then ghg^(-1) = (1 + √2)√2(1 - √2)^(-1) = (√2 + 2)(1 - √2)^(-1) = (√2 + 2)/(1 - √2), which is not in the subgroup. Therefore, the set is not a normal subgroup of C-{0}.
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Let G be a connected graph with 2k vertices of odd degree, with k > 1. Prove that there is a partition of E(G) in k open walks whose endpoints are vertices of odd degree.
The endpoints of the walks Wi and P1 form a partition of the edges of G into k open walks whose endpoints are vertices of odd degree, as desired. Therefore, we have proved that there is a partition of E(G) into k open walks whose endpoints are vertices of odd degree.
Note that the endpoints of P1 are v1 and v2, which have odd degree.Let G' be the graph obtained from G by removing the edges in P1.
Then, G' is still connected (since there is a path between any two vertices in G, and we have not removed any vertices).
Moreover, G' has 2(k-1) vertices of odd degree (since we have removed two vertices of odd degree and all other vertices have the same degree in both G and G').
By the induction hypothesis, we can partition the edges of G' into k-1 open walks whose endpoints are vertices of odd degree. L
et W1, W2, ..., W(k-1) be these walks. For each i, let ai and bi be the endpoints of Wi.
Then, ai and bi have odd degree in G'.Since we removed only the edges in P1 to obtain G', it follows that the edges in P1 are between vertices in {a1, b1, a2, b2, ..., a(k-1), b(k-1), v1, v2}.
Moreover, the degree of v1 and v2 in G' is even (since we removed the edges in P1 incident to v1 and v2), so they are not endpoints of any of the walks Wi.
Thus, the endpoints of the walks Wi and P1 form a partition of the edges of G into k open walks whose endpoints are vertices of odd degree, as desired.
Therefore, we have proved that there is a partition of E(G) into k open walks whose endpoints are vertices of odd degree.
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3. a) Find the center-radius form of the equation of the circle with
center (-2,5) and radius 3.
b) Graph the circle.
a) The center-radius form of the equation of the circle is
(Type an equation.)
b) Use the graphing tool to graph the circle.
10.
←
10+
8
16
4-
2-
+2
44-
e
-40
The equation of the circle is (x + 2)² + (y - 5)² = 9.
The center-radius form of the equation of the circle is
(x - h)² + (y - k)² = r², where (h, k) represents the coordinates of the center of the circle and r represents the radius.
In this case, the center is (-2, 5) and the radius is 3. Substituting these values into the center-radius form, we get:
(x - (-2))² + (y - 5)² = 3²
Simplifying further:
(x + 2)² + (y - 5)²= 9
So, the center-radius form of the equation of the circle is (x + 2)² + (y - 5)² = 9.
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What is the definition of the Euclidean inner product (or dot product, or scalar product) of two vectors u= (u),..., ud), v = (v1...., va) € Rd?
The Euclidean inner product, also known as the dot product or scalar product, is a binary operation defined for two vectors
u = (u1, u2, ..., ud) and
v = (v1, v2, ..., vd) in Rd. It is denoted as u · v.
The definition of the Euclidean inner product is as follows:
u · v = u1v1 + u2v2 + ... + udvd
The dot product of two vectors is the sum of the products of their corresponding components. The result is a scalar value that represents the "projection" of one vector onto the other and captures the geometric relationship between the vectors, including their lengths and the angle between them.
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Consider the ellipsoid 3x² + 2y² + z² = 15. Find all the points where the tangent plane to this ellipsoid is parallel to the plane 2y - 6x + z = 0.
(If there are several points, separate them by commas.)
The tangent plane to the ellipsoid is parallel to the given plane at point (-1, 1/2, 1/2).
The given ellipsoid is: 3x² + 2y² + z² = 15
The equation of the plane is: 2y - 6x + z = 0The normal vector to the plane is (-6, 2, 1)
Now let's find the gradient vector of the ellipsoid. ∇f(x, y, z) = <6x, 4y, 2z>∇f(P) gives us the normal vector to the tangent plane at point P.
To find all the points where the tangent plane to this ellipsoid is parallel to the plane, we need to equate the normal vectors and solve for x, y, and z.6x = -6, 4y = 2, and 2z = 1
The solution is x = -1, y = 1/2, and z = 1/2.The point on the ellipsoid is (-1, 1/2, 1/2)
Thus, the tangent plane to the ellipsoid is parallel to the given plane at point (-1, 1/2, 1/2).
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Let f: R2→→ R be a differentiable function. Assume that there exists an R> 0 such that (See Fig.) Show that f is uniformly continuous on R2. für alle means for all and mit means with its german ||dfx||C(R²;R) ≤ 1 für alle x E R2 mit ||x|| > R. X
To show that the function f is uniformly continuous on R², we need to demonstrate that for any given ε > 0, there exists a δ > 0 such that for all (x, y) and (a, b) in R², if ||(x, y) - (a, b)|| < δ, then |f(x, y) - f(a, b)| < ε.
Given that ||dfx||C(R²;R) ≤ 1 for all x ∈ R² with ||x|| > R, we can use this information to establish uniform continuity.
Let's proceed with the proof:
Suppose ε > 0 is given. We aim to find a δ > 0 that satisfies the condition mentioned above.
Since f is differentiable, we can apply the mean value theorem. For any (x, y) and (a, b) in R², there exists a point (c, d) on the line segment connecting (x, y) and (a, b) such that:
f(x, y) - f(a, b) = df(c, d) · ((x, y) - (a, b))
Taking the norm on both sides of the equation, we have:
|f(x, y) - f(a, b)| = ||df(c, d) · ((x, y) - (a, b))||
Now, let's estimate the norm using the given condition ||dfx||C(R²;R) ≤ 1:
|f(x, y) - f(a, b)| = ||df(c, d) · ((x, y) - (a, b))|| ≤ ||df(c, d)|| · ||(x, y) - (a, b)||
By the given condition, ||df(c, d)|| ≤ 1 for all (c, d) with ||(c, d)|| > R.
Now, let's consider the case when ||(x, y) - (a, b)|| < δ for some δ > 0. This implies that the line segment connecting (x, y) and (a, b) has a length less than δ.
Since the norm is a continuous function, the length of the line segment ||(x, y) - (a, b)|| is also continuous. Hence, we can find an R' > R such that if ||(x, y) - (a, b)|| < δ for some δ > 0, then ||(x, y) - (a, b)|| ≤ R'.
Applying the given condition, we have ||df(c, d)|| ≤ 1 for all (c, d) with ||(c, d)|| > R'. Therefore, for any line segment connecting (x, y) and (a, b) with ||(x, y) - (a, b)|| ≤ R', we have:
|f(x, y) - f(a, b)| ≤ ||df(c, d)|| · ||(x, y) - (a, b)|| ≤ 1 · ||(x, y) - (a, b)||
Since ||(x, y) - (a, b)|| < δ for some δ > 0, we have shown that |f(x, y) - f(a, b)| < ε, which completes the proof.
Therefore, we have established that the function f is uniformly continuous on R².
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The rate of change of a population P of an environment is determined by the logistic formula dP dt = 0.04P µ 1− P 20000¶ where t is in years since the beginning of 2015. So P(1) is the population at the beginning of 2016. Suppose P(0) = 1000.
Calculate P 0 (0). Explain what this number means
P₀(0) = 1000. The rate of change of a population P of an environment is determined by the logistic formula,dP/dt = 0.04P(1− P/20000)where t is in years since the beginning of 2015. So P(1) is the population at the beginning of 2016.
Suppose P(0) = 1000.
To calculate P₀(0), we put the value of t = 0 in the given equation as follows:dP/dt = 0.04P(1− P/20000)dP/dt = 0.04(1000)(1− 1000/20000)dP/dt = 0.04(1000)(1− 0.05)dP/dt = 0.04(1000)(0.95)dP/dt = 38
Since we have calculated P₀(0) as 1000, it means that at the beginning of 2015, the population of the environment was 1000.
dP/dt = 0.04P(1− P/20000)where t is in years since the beginning of 2015. So P(1) is the population at the beginning of 2016.
Hence, P₀(0) = 1000. The rate of change of a population P of an environment is determined by the logistic formula,dP/dt = 0.04P(1− P/20000)where t is in years since the beginning of 2015. So P(1) is the population at the beginning of 2016.
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Convert the complex number, z = 8 (cos(π/4)+sin(π/4)) from polar to rectangular form.
Enter your answer as a + bi.
The rectangular form of the complex number is 8√2. Since there is no imaginary component, the answer is written as (8√2 + 0i).
To convert a complex number from polar form to rectangular form, we can use the trigonometric identities for cosine and sine:
Given: z = 8(cos(π/4) + sin(π/4))
Using the identity cos(θ) + sin(θ) = √2sin(θ + π/4), we can rewrite the expression as: z = 8√2(sin(π/4 + π/4))
Now, using the identity sin(θ + π/4) = sin(θ)cos(π/4) + cos(θ)sin(π/4), we have: z = 8√2(sin(π/4)cos(π/4) + cos(π/4)sin(π/4))
Simplifying further: z = 8√2(1/2 + 1/2)
z = 8√2
So, the rectangular form of the complex number is 8√2. Since there is no imaginary component, the answer is written as (8√2 + 0i).
However, in standard notation, we usually omit the 0i term, so the final rectangular form is 8√2
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What is the appropriate measure of central tendency for parametric test: Mean Median Mode Range 0.25 points Save
For parametric test, the appropriate measure of central tendency is Mean.
Parametric tests are hypothesis tests that make assumptions about the distribution of the population. For example, normality and homoscedasticity are two common assumptions made by parametric tests. In contrast, nonparametric tests make no such assumptions about the underlying distribution of the population.
The mean is a popular and simple measure of central tendency. It is widely used in statistical analysis. It is a useful measure of central tendency in the following situations:
When data are interval or ratio in nature
When data are normally distributed
When there are no outliers
When the sample size is large and random
The following are the advantages of using mean:
It is easy to understand and calculate
It is not affected by extreme values or outliers
It can be used in parametric tests
It provides a precise estimate of the average value of the data
It is a stable measure of central tendency when the sample size is large
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the level of the root node in a tree of height h is (a) 0 (b) 1 (c) h-1 (d) h (e) h 1
The root node is also the highest level node in the binary tree, and its level is 0. The correct option is a.
A binary tree is a type of data structure that consists of nodes, each of which has two branches, a left and a right branch, and one root node. The root node is the top node in the tree and has no parent node.
The root node is also the highest level node in the binary tree, and its level is 0.
The root node in a binary tree with height h is at level 0.The level of the root node in a binary tree of height h is 0. A binary tree with a height of h has a maximum of h levels, and since the root node is at level 0, the maximum level is h-1.
A binary tree is a type of data structure used in computer science that is made up of nodes and branches. Each no
de has at most two branches, a left branch and a right branch.
The topmost node in the tree is called the root node. The root node has no parent nodes and is therefore at the highest level in the tree.
In a binary tree with height h, the root node is at level 0, and the maximum level in the tree is h-1.
Therefore, the level of the root node in a tree of height h is 0. The correct option is a.
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.Prove that , according Royden and Fitzpatrick, Real Analysis book
the measure space (R^n, L^n, µn) is complete
A measure space is complete if every subset of a null set is measurable. Thus, we can conclude that the measure space (R^n, L^n, µn) is complete, according to Royden and Fitzpatrick's Real Analysis book.
In the first paragraph:
According to Royden and Fitzpatrick's Real Analysis book, the measure space (R^n, L^n, µn) is considered complete. This implies that every subset of R^n that is a null set with respect to the Lebesgue measure is also a Lebesgue measurable set.
In the second paragraph:
To prove the completeness of the measure space (R^n, L^n, µn), we need to show that every subset of R^n that is a null set with respect to the Lebesgue measure is also a Lebesgue measurable set.
A null set is defined as a set with measure zero. In other words, its Lebesgue measure µn is equal to zero. A Lebesgue measurable set, on the other hand, is a set for which we can accurately define its measure using the Lebesgue measure.
In the Lebesgue measure theory, it can be proven that any subset of a null set is also a null set. Since null sets have measure zero, any subset of a null set will also have measure zero. Therefore, it follows that every subset of a null set is also a Lebesgue measurable set.
By definition, a measure space is complete if every subset of a null set is measurable. Thus, we can conclude that the measure space (R^n, L^n, µn) is complete, according to Royden and Fitzpatrick's Real Analysis book.
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Let A and B be events in a sample space such that PCA) = 6, PCB) = 7, and PUNB) = .1. Find: PAB). a. PAB) -0.14 b. P(AB) -0.79 c. PLAB) = 0.82 d. PLAB)=0.1
Given: PCA) = 6, PCB) = 7, and PUNB) = .1To Find: PAB Let's use the formula of probability to solve the given problem:
Probability of an event = Number of favourable outcomes / Total number of outcomes Probability of the union of two events (A and B) = [tex]P(A) + P(B) - P(AB)PUNB) = P(A) + P(B) - P(AB)0.1[/tex]= 6 + 7 - P(AB)P(AB) = 6 + 7 - 0.1 [tex]P(AB) = 12.9PAB = P(AB) / P(B)PAB)[/tex] = 12.9 / 7PAB) ≈ 1.84 Option b. P(AB) -0.79 is incorrect. Option c. PLAB) = 0.82 is incorrect.Option d. PLAB) = 0.1 is incorrect. Option a. PAB) -0.14 is incorrect.
The correct option is b. P(AB) -0.79
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The following is a set of data from a sample of n=7. 13 1 5 18 7 13 2 2 (a) Compute the first quartile (Qy), the third quartile (Q3), and the interquartile range. (b) List the five-number summary. (c) Construct a boxplot and describe the shape. The following is a set of data from a sample of n=7. 13 1 5 18 7 13 2 O (a) Compute the first quartile (Q), the third quartile (Q3), and the interquartile range. (b) List the five-number summary. (c) Construct a boxplot and describe the shape.
(a) To compute the first quartile (Q1), the third quartile (Q3), and the interquartile range, we need to arrange the data in ascending order:
1, 2, 5, 7, 13, 13, 18
First Quartile (Q1):
Q1 is the median of the lower half of the data. Since we have an odd number of data points (n = 7), Q1 will be the median of the first three values:
Q1 = 2
Third Quartile (Q3):
Q3 is the median of the upper half of the data. Again, since we have an odd number of data points, Q3 will be the median of the last three values:
Q3 = 13
Interquartile Range (IQR):
The IQR is the difference between Q3 and Q1:
IQR = Q3 - Q1 = 13 - 2 = 11
(b) The five-number summary consists of the minimum, Q1, median (Q2), Q3, and the maximum:
Minimum: 1
Q1: 2
Median (Q2): 7
Q3: 13
Maximum: 18
(c) To construct a boxplot, we use the five-number summary. The box equation represents the IQR, with the line inside the box representing the median (Q2). The whiskers extend to the minimum and maximum values, unless there are outliers.
Here is the boxplot description:
```
| |
--------|---|--------
| |
Minimum Q1 Q2 (Median) Q3 Maximum
```
Regarding the shape of the data, without further information or a visual representation, it is difficult to determine the shape accurately. However, based on the provided data, it appears to be skewed to the right (positively skewed) as the values are more spread out towards the higher end.
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do+one+of+the+following,+as+appropriate+:+find+the+critical+value+zα/2+or+find+the+critical+value+tα/2.+population+appears+to+be+normally+distributed.99%;+n=17+;+σ+is+unknown
The critical value of tα/2 is found. Population appears to be normally distributed with a confidence level of 99%, a sample size of 17, and an unknown σ.
The critical value of tα/2 is used when the sample size is small, and the population's standard deviation is unknown. A t-distribution is used to find critical values in this case. Here, the sample size is small (n=17), and σ is unknown, so we must use t-distribution to find the critical value. We need to find the t-value at α/2 with degrees of freedom (df) = n-1. Since the confidence level is 99%, the value of α = (1-CL)/2 = 0.01/2 = 0.005. The degrees of freedom (df) = n - 1 = 17 - 1 = 16. Using a t-distribution table, the critical value of tα/2 with df = 16 is found to be 2.921. Thus, the critical value of tα/2 is 2.921.
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Find the matrix A of the quadratic form associated with the equation. 3x² - 8xy − 3y² + 15 = 0 Find the eigenvalues of A. (Enter your answers as a comma-separated list.) λ = Find an orthogonal matrix P such that PTAP is diagonal. (Enter the matrix in the form [[row 1], [row 2], ...], where each row is a comma-separated list.) P =
The eigenvalues of A are λ = 7 and λ = -1. PTAP will be a diagonal matrix with the eigenvalues as diagonal entries.
To find the matrix A associated with the quadratic form, we need to consider the coefficients of the quadratic terms in the equation. Given the equation 3x² - 8xy - 3y² + 15 = 0, the matrix A is given by:
A = [[3, -4], [-4, -3]]
To find the eigenvalues of A, we can solve for the characteristic equation by finding the determinant of (A - λI) equal to zero, where I is the identity matrix:
det(A - λI) = det([[3 - λ, -4], [-4, -3 - λ]])
Expanding the determinant, we have:
(3 - λ)(-3 - λ) - (-4)(-4) = λ² - 6λ + 9 - 16 = λ² - 6λ - 7
Setting the determinant equal to zero and solving for λ, we have:
λ² - 6λ - 7 = 0
Using the quadratic formula, we find the roots:
λ = (6 ± √(6² + 4(7))) / 2
= (6 ± √(36 + 28)) / 2
= (6 ± √64) / 2
= (6 ± 8) / 2
= 7, -1
So, the eigenvalues of A are λ = 7 and λ = -1.
To find an orthogonal matrix P such that PTAP is diagonal, we can find the eigenvectors corresponding to the eigenvalues λ = 7 and λ = -1. The eigenvectors are the normalized solutions to the equation (A - λI)v = 0.
For λ = 7:
(A - 7I)v = 0
[[-4, -4], [-4, -10]]v = 0
Solving the system of equations, we find v₁ = [-1, 1].
For λ = -1:
(A - (-1)I)v = 0
[[4, -4], [-4, -2]]v = 0
Solving the system of equations, we find v₂ = [1, 2].
To construct the orthogonal matrix P, we normalize the eigenvectors v₁ and v₂ to have unit length.
P = [[-1/√2, 1/√5], [1/√2, 2/√5]]
Therefore, PTAP will be a diagonal matrix with the eigenvalues as diagonal entries.
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Determine whether the following are linear transformations from C[0, 1] to R1:
A. L(f) = f(0)
B. L(f) = |f(0)|
C. L(f) = [f(0) + f(1)] / 2
D. L(f) = {}1/2
A. L is a linear transformation.
B. L is not a linear transformation.
C. L is a linear transformation.
D. The function L(f) = {}1/2 is not defined.
Explanation:
To determine whether a function is a linear transformation from C[0,1] to R1, we must first show that it is a linear function.
For this, we can apply two tests: (1) whether it preserves addition and (2) whether it preserves scalar multiplication.
Let L be a function from C[0, 1] to R1.
Let f and g be functions in C[0, 1] and let c be a scalar in R.
Then:
(A) L(f + g) = (f + g)(0)
= f(0) + g(0)
= L(f) + L(g)
L(cf) = (cf)(0)
= c(f(0))
= cL(f)
So, L is a linear transformation.
Let's check each transformation below to see if it meets the same requirements.
Answer: A.
L(f) = f(0)
Here
L(f + g) = (f + g)(0)
= f(0) + g(0)
= L(f) + L(g) and
L(cf) = (cf)(0)
= c(f(0))
= cL(f)
Therefore, L is a linear transformation.
Answer: B.
L(f) = |f(0)|
Here, L(2) = |2|
= 2 and
L(-2) = |-2|
= 2.
Thus, L does not preserve scalar multiplication, so L is not a linear transformation.
Answer: C.
L(f) = [f(0) + f(1)] / 2
Here
L(f + g) = [(f + g)(0) + (f + g)(1)] / 2
= [f(0) + g(0) + f(1) + g(1)] / 2
= (f(0) + f(1)) / 2 + (g(0) + g(1)) / 2
= L(f) + L(g) and
L(cf) = [(cf)(0) + (cf)(1)] / 2
= [cf(0) + cf(1)] / 2
= c[f(0) + f(1)] / 2
= cL(f)
Thus, L is a linear transformation.
Answer: D.
L(f) = {}1/2
The function L(f) = {}1/2 is not defined.
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Mathematical Modelling: Choosing a cell phone plan Today, there are many different companies offering different cell phone plans to consumers. The plans these companies offer vary greatly and it can be difficult for consumers to select the best plan for their usage. This project aims to help you to understand which plan may be suitable for different users. You are required to draw a mathematical model for each plan and then use this model to recommend a suitable plan for different consumers based on their needs. Assumption: You are to assume that wifi calls are not applicable. Question 1 The following are 4 different plans offered by a particular telco company: Plan 1: A flat fee of $50 per month for unlimited calls. Plan 2: A $30 per month fee for a total of 30 hours of calls and an additional charge of $0.01 per minute for all minutes over 30 hours. Plan 3: A $5 per month fee and a charge of $0.04 per minute for all calls. Plan 4: A charge of $0.05 per minute for all calls: there is no additional fees. (a) If y is the charges of the plan and x is the number of hours spent on calls, what is the gradient and y-intercept of the function for each plan? (10 marks) (b) Write the equation of the function for each plan. (8 marks) potions -Using functions you have created in Question 1, plot a graph using EXCEL to show all the 4 plans in the same graph. (Hint: Suitable range of x-axis is 0 to 100 hours with the interval of 5 hours. Choose a suitable range for the y-axis.) - Label your graph and axis appropriately. (11 marks)
The values of the gradient and y-intercept of the function is obtained. The graph above shows all the 4 plans in the same graph.
(a) If y is the charges of the plan and x is the number of hours spent on calls, the gradient and y-intercept of the function for each plan are given below:
Plan 1: A flat fee of $50 per month for unlimited calls Gradient: 0,
Y-intercept: 50
Plan 2: A $30 per month fee for a total of 30 hours of calls and an additional charge of $0.01 per minute for all minutes over 30 hours.
Gradient: 0.0003, Y-intercept: 30
Plan 3: A $5 per month fee and a charge of $0.04 per minute for all calls.
Gradient: 0.04, Y-intercept: 5
Plan 4: A charge of $0.05 per minute for all calls: there is no additional fees.
Gradient: 0.05, Y-intercept: 0
(b) The equation of the function for each plan is given below:
Plan 1: y = 50
Plan 2: y = 0.0003x + 30
Plan 3: y = 0.04x + 5
Plan 4: y = 0.05x
Using functions created in Question 1, we can plot a graph using EXCEL to show all the 4 plans in the same graph.
The suitable range of the x-axis is 0 to 100 hours with the interval of 5 hours and the y-axis has the suitable range as 0 to 65 dollars with the interval of 5 dollars.
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(1)
identify the five-number (BoxPlot) summary of the following data set. 7,11,21,28,32,33,37,43
The five-number summary for the given data set include the following:
Minimum (Min) = 7.First quartile (Q₁) = 13.5.Median (Med) = 30.Third quartile (Q₃) = 36.Maximum (Max) = 43.What is a box-and-whisker plot?In Mathematics and Statistics, a box plot is a type of chart that can be used to graphically or visually represent the five-number summary of a data set with respect to locality, skewness, and spread.
Based on the information provided about the data set, the five-number summary for the given data set include the following:
Minimum (Min) = 7.First quartile (Q₁) = 13.5.Median (Med) = 30.Third quartile (Q₃) = 36.Maximum (Max) = 43.In conclusion, we can logically deduce that the maximum number is 43 while the minimum number is 7, and the median is equal to 30.
Read more on boxplot here: brainly.com/question/29648407
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