Dumi deposited R2,461.82 in the savings account. Zola's account had an effective interest rate of approximately 18.14% over two years. Rambau would be charged a simple interest rate of 23.0% per annum. Mamzodwa will need 2 years and 1.6 weeks to save for the R30,835.42 mobile kitchen.
On 16 April, Dumi deposited an amount of money in a savings account that earns 8.5% per annum, simple interest. She intends to withdraw the balance of R2 599 on B December of the same year to buy her brother a smartphone. The amount of money that Dumi deposited is calculated as follows:
Let the amount deposited = P
The amount withdrawn = R2 599
Interest rate = 8.5%
Simple Interest formula = I = PRT
Where R = 8.5%, P = ?, I = R2 599, and T = 8 months = 8/12 years
Substituting the values gives:
R2 599 = P × 8.5% × 8/12
Simplifying and solving for P gives:
P = R2 599 / (8.5% × 8/12) = R2 461.82
Therefore, the amount of money that Dumi deposited is R2 461.82.
Approximately, what is the effective interest rate over two years for Zola's account if the balance of his account grew from R4 500,00 to R5268,24, and the money is invested in a money market fund that pays interest on a daily basis?
The effective annual interest rate is calculated using the formula:
R = [(1 + r/n)^n - 1]
where R is the effective annual interest rate, r is the nominal interest rate, and n is the number of compounding periods per year.
Let r be the nominal interest rate and n be the number of compounding periods per year. Since interest is compounded daily, then n = 365 days in a year.
The effective annual interest rate is therefore:
R = [(1 + r/365)^365 - 1]
Given that the balance of his account grew from R4 500,00 to R5268,24 in two years, the interest earned during the two years is:
R5268,24 - R4 500,00 = R768.24
The nominal interest rate is the ratio of the interest earned to the principal amount of R4 500,00. Therefore,
r = (768.24 / 4 500) × 100% = 17.07%
The effective annual interest rate is:
R = [(1 + 17.07%/365)^365 - 1] = 18.14%
Therefore, the effective interest rate over this period is approximately 18.14%.
Rambau has been given the option of either paying his R2 500 personal loan now or settling it for R2 730 after four months. If he chooses to pay after four months, the simple interest rate per annum, at which he would be charged, is:
Let the interest rate be r.
The interest to be charged in 4 months = R2 730 - R2 500 = R230
Simple interest formula, I = PRT
Where P = R2 500, T = 4/12 years and I = R230.
Substituting the values gives:
R230 = R2 500 × r × 4/12
Solving for r gives:
r = (R230 × 12) / (R2 500 × 4) = 23.0%
Therefore, the simple interest rate per annum, at which Rambau would be charged, is 23.0%.
How long will it take Mamzodwa to save towards a R30 835.42 mobile kitchen for her food catering business if she deposits R125 000 now into a savings account earning 10.5% interest per year, compounded weekly?
The formula for the future value of a deposit compounded weekly at an interest rate of r is given by:
A = P(1 + r/52)^(52t)
where A is the future value, P is the principal amount, r is the interest rate per annum, t is the time in years, and 52 is the number of compounding periods per year.
Let t be the time in years that it will take to accumulate the R30 835.42 necessary for Mamzodwa's mobile kitchen, with a deposit of R125 000 now at an interest rate of 10.5% compounded weekly.
Substituting the given values gives:
R30 835.42 = R125 000(1 + 10.5%/52)^(52t)
Simplifying the above equation gives:
(1 + 10.5%/52)^(52t) = R30 835.42 / R125 000
(1 + 10.5%/52)^(52t) = 1.246683256
Using logarithms, t is solved as follows:
52t × log(1 + 10.5%/52) = log(1.246683256)
t = [log(1.246683256)] / [52 × log(1 + 10.5%/52)]
t ≈ 2.14 years = 2 years and 1.6 weeks
Therefore, it will take Mamzodwa 2 years and 1.6 weeks to save towards this amount. (Option B)
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Find the unique solution of the second-order initial value problem. y' + 7y' + 10y= 0, y(0)=-9, y'(0) = 33
The unique solution to the second-order initial value problem y' + 7y' + 10y = 0, y(0) = -9, y'(0) = 33 is y(x) = -3e^(-2x) - 6e^(5x).
To find the solution to the second-order initial value problem, we first write the characteristic equation by replacing the derivatives with the corresponding variables:
r^2 + 7r + 10 = 0
Solving the quadratic equation, we find two distinct roots: r = -2 and r = -5.
The general solution to the homogeneous equation y'' + 7y' + 10y = 0 is given by y(x) = c1e^(-2x) + c2e^(-5x), where c1 and c2 are constants.
Next, we apply the initial conditions y(0) = -9 and y'(0) = 33 to determine the specific values of c1 and c2.
Plugging in x = 0, we get -9 = c1 + c2.
Differentiating y(x), we have y'(x) = -2c1e^(-2x) - 5c2e^(-5x). Plugging in x = 0, we get 33 = -2c1 - 5c2.
Solving the system of equations -9 = c1 + c2 and 33 = -2c1 - 5c2, we find c1 = -3 and c2 = -6.
Therefore, the unique solution to the initial value problem is y(x) = -3e^(-2x) - 6e^(5x).
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Select and Explain which of the following statements are true In
a simultaneous game? More than one statement can be True.
1) MaxMin = MinMax
2) MaxMin <= MinMax
3) MaxMin >= MinMax
Both statements 1) MaxMin = MinMax and 2) MaxMin <= MinMax are true in a simultaneous game. Statement 3) MaxMin >= MinMax is also true in a simultaneous game.
In a simultaneous game, the following statements are true:
1) MaxMin = MinMax: This statement is true in a simultaneous game. The MaxMin value represents the maximum payoff that a player can guarantee for themselves regardless of the strategies chosen by the other players. The MinMax value, on the other hand, represents the minimum payoff that a player can ensure that the opponents will not be able to make them worse off. In a well-defined and finite simultaneous game, the MaxMin value and the MinMax value are equal.
2) MaxMin <= MinMax: This statement is true in a simultaneous game. Since the MaxMin and MinMax values represent the best outcomes that a player can guarantee or prevent, respectively, it follows that the maximum guarantee for a player (MaxMin) cannot exceed the minimum prevention for the opponents (MinMax).
3) MaxMin >= MinMax: This statement is also true in a simultaneous game. Similar to the previous statement, the maximum guarantee for a player (MaxMin) must be greater than or equal to the minimum prevention for the opponents (MinMax). This ensures that a player can at least protect themselves from the opponents' attempts to minimize their payoff.
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Solve the following recurrence relations. For each one come up with a precise function of n in closed form (i.e., resolve all sigmas, recursive calls of function T, etc) using the substitution method. Note: An asymptotic answer is not acceptable for this question. Justify your solution and show all your work.
b) T(n)=4T(n/2)+n , T(1)=1
c) T(n)= 2T(n/2)+1, T(1)=1
Solving recurrence relations involves finding a closed-form expression or formula for the terms of a sequence based on their previous terms. Recurrence relations are mathematical equations that define the relationship between a term and one or more previous terms in a sequence.
a)Using the substitution method to find the precise function of n in closed form for the recurrence relation: T(n)=2T(n/3)+n²T(n) = 2T(n/3) + n²T(n/9) + n²= 2[2T(n/9) + (n/3)²] + n²= 4T(n/9) + 2n²/9 + n²= 4[2T(n/27) + (n/9)²] + 2n²/9 + n²= 8T(n/27) + 2n²/27 + 2n²/9 + n²= 8[2T(n/81) + (n/27)²] + 2n²/27 + 2n²/9 + n²= 16T(n/81) + 2n²/81 + 2n²/27 + 2n²/9 + n²= ...The pattern for this recurrence relation is a = 2, b = 3, f(n) = n²T(n/9). Using the substitution method, we have:T(n) = Θ(f(n))= Θ(n²log₃n)So the precise function of n in closed form is Θ(n²log₃n).
b) Using the substitution method to find the precise function of n in closed form for the recurrence relation T(n)=4T(n/2)+n, T(1)=1.T(n) = 4T(n/2) + nT(n/2) = 4T(n/4) + nT(n/4) = 4T(n/8) + n + nT(n/8) = 4T(n/16) + n + n + nT(n/16) = 4T(n/32) + n + n + n + nT(n/32) = ...T(n/2^k) + n * (k-1)The base case is T(1) = 1. We can solve for k using n/2^k = 1:k = log₂nWe can then substitute k into the equation: T(n) = 4T(n/2^log₂n) + n * (log₂n - 1)T(n) = 4T(1) + n * (log₂n - 1)T(n) = 4 + nlog₂n - nTherefore, the precise function of n in closed form is T(n) = Θ(nlog₂n).
c) Using the substitution method to find the precise function of n in closed form for the recurrence relation T(n)= 2T(n/2)+1, T(1)=1.T(n) = 2T(n/2) + 1T(n/2) = 2T(n/4) + 1 + 2T(n/4) + 1T(n/4) = 2T(n/8) + 1 + 2T(n/8) + 1 + 2T(n/8) + 1 + 2T(n/8) + 1T(n/8) = 2T(n/16) + 1 + ...T(n/2^k) + kThe base case is T(1) = 1. We can solve for k using n/2^k = 1:k = log₂nWe can then substitute k into the equation: T(n) = 2T(n/2^log₂n) + log₂nT(n) = 2T(1) + log₂nT(n) = 1 + log₂nTherefore, the precise function of n in closed form is T(n) = Θ(log₂n).
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Determine whether the points lie on a straight line. P(−2,1,0),Q(2,3,2),R(1,4,−1)
Therefore, the points P(-2, 1, 0), Q(2, 3, 2), and R(1, 4, -1) lie on a straight line.
To determine whether the points P(-2, 1, 0), Q(2, 3, 2), and R(1, 4, -1) lie on a straight line, we can check if the direction vectors between any two points are proportional. The direction vector between two points can be obtained by subtracting the coordinates of one point from the coordinates of the other point.
Direction vector PQ = Q - P
= (2, 3, 2) - (-2, 1, 0)
= (2 - (-2), 3 - 1, 2 - 0)
= (4, 2, 2)
Direction vector PR = R - P
= (1, 4, -1) - (-2, 1, 0)
= (1 - (-2), 4 - 1, -1 - 0)
= (3, 3, -1)
Now, let's check if the direction vectors PQ and PR are proportional.
For the direction vectors PQ = (4, 2, 2) and PR = (3, 3, -1) to be proportional, their components must be in the same ratio.
Checking the ratios of the components, we have:
4/3 = 2/3 = 2/-1
Since the ratios are the same, we can conclude that the points P, Q, and R lie on the same straight line.
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You estimate a simple linear regression and get the following results: Coefficients Standard Error t-stat p-value Intercept 0.083 3.56 0.9822 x 1.417 0.63 0.0745 You are interested in conducting a test of significance, in particular, you want to know whether the slope coefficient differs from 1. What would be the value of your test statistic (round to two decimal places).
Rounding it to two decimal places, we have: t-stat ≈ 0.66
To test the significance of the slope coefficient, we can calculate the test statistic using the formula:
t-stat = (coefficient - hypothesized value) / standard error
In this case, we want to test whether the slope coefficient (1.417) differs from 1. Therefore, the hypothesized value is 1.
Plugging in the values, we get:
t-stat = (1.417 - 1) / 0.63
Calculating this will give us the test statistic. Rounding it to two decimal places, we have:
t-stat ≈ 0.66
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Each of the following statements is false. Show each statement is false by providing explicit 2×2 matrix counterexamples. Below the homework problems is an example of the work you should show. a. For any square matrix A,ATA=AAT. b. ( 2 points) For any two square matrices, (AB)2=A2B2. c. For any matrix A, the only solution to Ax=0 is x=0 (note: Your counterexample will involve a 2×2 matrix A and a 2×1 vector x.
Ax = 0, but x is not equal to 0. Therefore, the statement is false.
a. For any square matrix A, ATA = AAT.
Counterexample:
Let A = [[1, 2], [3, 4]]
Then ATA = [[1, 2], [3, 4]] [[1, 3], [2, 4]] = [[5, 11], [11, 25]]
AAT = [[1, 3], [2, 4]] [[1, 2], [3, 4]] = [[7, 10], [15, 22]]
Since ATA is not equal to AAT, the statement is false.
b. For any two square matrices, (AB)2 = A2B2.
Counterexample:
Let A = [[1, 2], [3, 4]]
Let B = [[5, 6], [7, 8]]
Then (AB)2 = ([[1, 2], [3, 4]] [[5, 6], [7, 8]])2 = [[19, 22], [43, 50]]2 = [[645, 748], [1479, 1714]]
A2B2 = ([[1, 2], [3, 4]])2 ([[5, 6], [7, 8]])2 = [[7, 10], [15, 22]] [[55, 66], [77, 92]] = [[490, 660], [1050, 1436]]
Since (AB)2 is not equal to A2B2, the statement is false.
c. For any matrix A, the only solution to Ax = 0 is x = 0.
Counterexample:
Let A = [[1, 1], [1, 1]]
Let x = [[1], [-1]]
Then Ax = [[1, 1], [1, 1]] [[1], [-1]] = [[0], [0]]
In this case, Ax = 0, but x is not equal to 0. Therefore, the statement is false.
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There are 1006 people who work in an office building. The building has 8 floors, and almost the same number of people work on each floor. Which of the following is the best estimate, rounded to the nearest hundred, of the number of people that work on each floor?
The rounded value to the nearest hundred is 126
There are 1006 people who work in an office building. The building has 8 floors, and almost the same number of people work on each floor.
To find the best estimate, rounded to the nearest hundred, of the number of people that work on each floor.
What we have to do is divide the total number of people by the total number of floors in the building, then we will round off the result to the nearest hundred.
In other words, we need to perform the following operation:\[\frac{1006}{8}\].
Step-by-step explanation To perform the operation, we will use the following steps:
Divide 1006 by 8. 1006 ÷ 8 = 125.75,
Round off the quotient to the nearest hundred. The digit in the hundredth position is 5, so we need to round up. The rounded value to the nearest hundred is 126.
Therefore, the best estimate, rounded to the nearest hundred, of the number of people that work on each floor is 126.
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∣3x−2∣≤9 1. Write the absolute value inequality as a compound inequality without absolute value bars. That is. write the inequality as a 3-part inequality or an OR inequality. 2. Solve. Write your answer in interval notation or set-builder notation.
The solution to the absolute value inequality ∣3x−2∣≤9 is x ≤ 11/3 or x ≥ -7/3.
1. The absolute value inequality ∣3x−2∣≤9 can be written as a compound inequality without absolute value bars using a 3-part inequality or an OR inequality.
Using a 3-part inequality: -9 ≤ 3x - 2 ≤ 9
Using an OR inequality: (3x - 2) ≤ 9 or -(3x - 2) ≤ 9
2. To solve the absolute value inequality, we can solve each part of the compound inequality separately.
For the first part:
3x - 2 ≤ 9
Adding 2 to both sides:
3x ≤ 11
Dividing both sides by 3 (since the coefficient of x is 3):
x ≤ 11/3
For the second part:
-(3x - 2) ≤ 9
Multiplying both sides by -1 (which changes the direction of the inequality):
3x - 2 ≥ -9
Adding 2 to both sides:
3x ≥ -7
Dividing both sides by 3:
x ≥ -7/3
Therefore, the solution to the inequality ∣3x−2∣≤9 is x ≤ 11/3 or x ≥ -7/3.
In interval notation, the solution can be expressed as (-∞, -7/3] ∪ [11/3, +∞). This means that x can take any value less than or equal to -7/3 or any value greater than or equal to 11/3. In set-builder notation, the solution is {x | x ≤ 11/3 or x ≥ -7/3}.
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if 36 out of 304 students said they love statistics, find an 84% confidence interval for the true percentage of students who love statistics. g
The 84% confidence interval for the true percentage of students who love statistics is approximately 10% to 34%.
To find the confidence interval for the true percentage of students who love statistics,
Use the formula for calculating a confidence interval for a proportion.
Start with the given information: 36 out of 304 students said they love statistics.
Find the sample proportion (P):
P = number of successes/sample size
P = 36 / 304
P ≈ 0.1184
Find the standard error (SE):
SE = √((P * (1 - P)) / n)
SE = √((0.1184 x (1 - 0.1184)) / 304)
SE ≈ 0.161
Find the margin of error (ME):
ME = critical value x SE
Since we want an 84% confidence interval, we need to find the critical value. We can use a Z-score table to find it.
The critical value for an 84% confidence interval is approximately 1.405.
ME = 1.405 x 0.161
ME ≈ 0.226
Calculate the confidence interval:
Lower bound = P - ME
Lower bound = 0.1184 - 0.226
Lower bound ≈ -0.108
Upper bound = P + ME
Upper bound = 0.1184 + 0.226
Upper bound ≈ 0.344
Therefore, the 84% confidence interval for the true percentage of students who love statistics is approximately 10% to 34%.
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Suppose A,B,C, and D are sets, and ∣A∣=∣C∣ and ∣B∣=∣D∣. Show that if ∣A∣≤∣B∣ then ∣C∣≤∣D∣. Show also that if ∣A∣<∣B∣ then ∣C∣<∣D∣
If A,B,C, and D are sets then
1. |A| ≤ |B| and |A| = |C|, |B| = |D|, then |C| ≤ |D|.
Similarly, if
2. |A| < |B| and |A| = |C|, |B| = |D|, then |C| < |D|.
To prove the given statements:
1. If |A| ≤ |B| and |A| = |C|, |B| = |D|, then |C| ≤ |D|.
Since |A| = |C| and |B| = |D|, we can establish a one-to-one correspondence between the elements of A and C, and between the elements of B and D.
If |A| ≤ |B|, it means there exists an injective function from A to B (a function that assigns distinct elements of B to distinct elements of A).
Since there is a one-to-one correspondence between the elements of A and C, we can construct a function from C to B by mapping the corresponding elements. Let's call this function f: C → B. Since A ≤ B, the function f can also be viewed as a function from C to A, which means |C| ≤ |A|.
Now, since |A| ≤ |B| and |C| ≤ |A|, we can conclude that |C| ≤ |A| ≤ |B|. By transitivity, we have |C| ≤ |B|, which proves the statement.
2. If |A| < |B| and |A| = |C|, |B| = |D|, then |C| < |D|.
Similar to the previous proof, we establish a one-to-one correspondence between the elements of A and C, and between the elements of B and D.
If |A| < |B|, it means there exists an injective function from A to B but no bijective function exists between A and B.
Since there is a one-to-one correspondence between the elements of A and C, we can construct a function from C to B by mapping the corresponding elements. Let's call this function f: C → B. Since A < B, the function f can also be viewed as a function from C to A.
Now, if |C| = |A|, it means there exists a bijective function between C and A, which contradicts the fact that no bijective function exists between A and B.
Therefore, we can conclude that if |A| < |B|, then |C| < |D|.
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Nathan correctly graphed the line of the inequality x+4y>4 on a coordinate grid, as shown, but did not shade the solution set. Which of the following points would appear in the solution set of this inequality?
The inequality in the graph is x + 4y > 4, with Nathan not shading the solution set.We will then substitute the coordinates of the solution set that satisfies the inequality.The points (0, 0), (1, 0), and (3, 1) are the ones that will appear in the solution set.
Points on the line of the inequality are substituted into the inequality to determine whether they belong to the solution set. Since the line itself is not part of the solution set, it is critical to verify whether the inequality contains "<" or ">" instead of "<=" or ">=". This indicates whether the boundary line should be included in the answer.To find out the solution set, choose a point within the region. The point to use should not be on the line, but instead, it should be inside the area enclosed by the inequality graph. For instance, (0,0) is in the region.
The solution set of x + 4y > 4 is located below the line on the coordinate plane. Any point below the line will satisfy the inequality. That means all of the points located below the line will be the solution set.
The solution set for inequality x + 4y > 4 will be any point that is under the line, thus the points (0, 0), (1, 0), and (3, 1) are the ones that will appear in the solution set.
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A mathematical sentence with a term in one variable of degree 2 is called a. quadratic equation b. linear equation c. binomial d. monomial
The correct answer is option a. A mathematical sentence with a term in one variable of degree 2 is called a quadratic equation.
A mathematical sentence with a term in one variable of degree 2 is called a quadratic equation. A quadratic equation is a polynomial equation of degree 2, where the highest power of the variable is 2. It can be written in the form ax^2 + bx + c = 0, where a, b, and c are coefficients and x is the variable. The term in one variable of degree 2 represents the squared term, which is the highest power of x in a quadratic equation.
This term is responsible for the U-shaped graph that is characteristic of quadratic functions. Therefore, the correct answer is option a. A mathematical sentence with a term in one variable of degree 2 is called a quadratic equation.
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Use translations to graph the given function. g(x)=\frac{1}{x-1}+3
The function g(x) = 1/(x - 1) + 3 can be graphed using translations. The graph is obtained by shifting the graph of the parent function 1/(x) to the right by 1 unit and vertically up by 3 units.
The parent function of g(x) is 1/(x), which has a vertical asymptote at x = 0 and a horizontal asymptote at y = 0. To graph g(x) = 1/(x - 1) + 3, we apply translations to the parent function.
First, we shift the graph 1 unit to the right by adding 1 to the x-coordinate. This causes the vertical asymptote to shift from x = 0 to x = 1. Next, we shift the graph vertically up by adding 3 to the y-coordinate. This moves the horizontal asymptote from y = 0 to y = 3.
By applying these translations, we obtain the graph of g(x) = 1/(x - 1) + 3. The graph will have a vertical asymptote at x = 1 and a horizontal asymptote at y = 3. It will be a hyperbola that approaches these asymptotes as x approaches positive or negative infinity. The shape of the graph will be similar to the parent function 1/(x), but shifted to the right by 1 unit and up by 3 units.
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Find an equation of the tangent plane to the given surface at the specified point. z=xsin(y−x),(9,9,0)
Therefore, the equation of the tangent plane to the surface z = xsin(y - x) at the point (9, 9, 0) is z = 9y - 81.
To find the equation of the tangent plane to the surface z = xsin(y - x) at the point (9, 9, 0), we need to find the partial derivatives of the surface with respect to x and y. The partial derivative of z with respect to x (denoted as ∂z/∂x) can be found by differentiating the expression of z with respect to x while treating y as a constant:
∂z/∂x = sin(y - x) - xcos(y - x)
Similarly, the partial derivative of z with respect to y (denoted as ∂z/∂y) can be found by differentiating the expression of z with respect to y while treating x as a constant:
∂z/∂y = xcos(y - x)
Now, we can evaluate these partial derivatives at the point (9, 9, 0):
∂z/∂x = sin(9 - 9) - 9cos(9 - 9) = 0
∂z/∂y = 9cos(9 - 9) = 9
The equation of the tangent plane at the point (9, 9, 0) can be written in the form:
z - z0 = (∂z/∂x)(x - x0) + (∂z/∂y)(y - y0)
Substituting the values we found:
z - 0 = 0(x - 9) + 9(y - 9)
Simplifying:
z = 9y - 81
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Find the solution to the difference equations in the following problems:
an+1=−an+2, a0=−1 an+1=0.1an+3.2, a0=1.3
The solution to the second difference equation is:
an = 3.55556, n ≥ 0.
Solution to the first difference equation:
Given difference equation is an+1 = -an + 2, a0 = -1
We can start by substituting n = 0, 1, 2, 3, 4 to get the values of a1, a2, a3, a4, a5
a1 = -a0 + 2 = -(-1) + 2 = 3
a2 = -a1 + 2 = -3 + 2 = -1
a3 = -a2 + 2 = 1 + 2 = 3
a4 = -a3 + 2 = -3 + 2 = -1
a5 = -a4 + 2 = 1 + 2 = 3
We can observe that the sequence repeats itself every 4 terms, with values 3, -1, 3, -1. Therefore, the general formula for an is:
an = (-1)n+1 * 2 + 1, n ≥ 0
Solution to the second difference equation:
Given difference equation is an+1 = 0.1an + 3.2, a0 = 1.3
We can start by substituting n = 0, 1, 2, 3, 4 to get the values of a1, a2, a3, a4, a5
a1 = 0.1a0 + 3.2 = 0.1(1.3) + 3.2 = 3.43
a2 = 0.1a1 + 3.2 = 0.1(3.43) + 3.2 = 3.5743
a3 = 0.1a2 + 3.2 = 0.1(3.5743) + 3.2 = 3.63143
a4 = 0.1a3 + 3.2 = 0.1(3.63143) + 3.2 = 3.648857
a5 = 0.1a4 + 3.2 = 0.1(3.648857) + 3.2 = 3.659829
We can observe that the sequence appears to converge towards a limit, and it is reasonable to assume that the limit is the solution to the difference equation. We can set an+1 = an = L and solve for L:
L = 0.1L + 3.2
0.9L = 3.2
L = 3.55556
Therefore, the solution to the second difference equation is:
an = 3.55556, n ≥ 0.
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Your answer is INCORRECT. Suppose that you are 34 years old now, and that you would like to retire at the age of 75 . Furthermore, you would like to have a retirement fund from which you can draw an income of $70,000 annually. You plan to reach this goal by making monthly deposits into an investment plan until you retire. How much do you need to deposit each month? Assume an APR of 8% compounded monthly, both as you pay into the retirement fund and when you collect from it later. a) $213.34 b) $222.34 c) $268.34 d) $312.34 e) None of the above.
Option a) $213.34 is the correct answer.
Given that, Suppose that you are 34 years old now and that you would like to retire at the age of 75. Furthermore, you would like to have a retirement fund from which you can draw an income of $70,000 annually. You plan to reach this goal by making monthly deposits into an investment plan until you retire. The amount to be deposited each month needs to be calculated. It is assumed that the annual interest rate is 8% and compounded monthly.
The formula for the future value of the annuity is given by, [tex]FV = C * ((1+i)n -\frac{1}{i} )[/tex]
Where, FV = Future value of annuity
C = Regular deposit
n = Number of time periods
i = Interest rate per time period
In this case, n = (75 – 34) × 12 = 492 time periods and i = 8%/12 = 0.0067 per month.
As FV is unknown, we solve the equation for C.
C = FV * (i / ( (1 + i)n – 1) ) / (1 + i)
To get the value of FV, we use the formula,FV = A × ( (1 + i)n – 1 ) /i
where, A = Annual income after retirement
After substituting the values, we get the amount to be deposited as $213.34.
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\section*{Problem 5}
The sets $A$, $B$, and $C$ are defined as follows:\\
\[A = {tall, grande, venti}\]
\[B = {foam, no-foam}\]
\[C = {non-fat, whole}\]\\
Use the definitions for $A$, $B$, and $C$ to answer the questions. Express the elements using $n$-tuple notation, not string notation.\\
\begin{enumerate}[label=(\alph*)]
\item Write an element from the set $A\, \times \,B \, \times \,C$.\\\\
%Enter your answer below this comment line.
\\\\
\item Write an element from the set $B\, \times \,A \, \times \,C$.\\\\
%Enter your answer below this comment line.
\\\\
\item Write the set $B \, \times \,C$ using roster notation.\\\\
%Enter your answer below this comment line.
\\\\
\end{enumerate}
\end{document}
the set [tex]$B \times C$[/tex] can be written using roster notation as [tex]\{(foam, non$-$fat),[/tex] (foam, whole), [tex](no$-$foam, non$-$fat), (no$-$foam, whole)\}$[/tex]
We can write [tex]$A \times B \times C$[/tex] as the set of all ordered triples [tex]$(a, b, c)$[/tex], where [tex]a \in A$, $b \in B$ and $c \in C$[/tex]. One such example of an element in this set can be [tex]($tall$, $foam$, $non$-$fat$)[/tex].
Thus, one element from the set
[tex]A \times B \times C$ is ($tall$, $foam$, $non$-$fat$).[/tex]
We can write [tex]$B \times A \times C$[/tex] as the set of all ordered triples [tex](b, a, c)$, where $b \in B$, $a \in A$ and $c \in C$[/tex].
One such example of an element in this set can be [tex](foam$, $tall$, $non$-$fat$)[/tex].
Thus, one element from the set [tex]B \times A \times C$ is ($foam$, $tall$, $non$-$fat$)[/tex].
We know [tex]B = \{foam, no$-$foam\}$ and $C = \{non$-$fat, whole\}$[/tex].
Therefore, [tex]$B \times C$[/tex] is the set of all ordered pairs [tex](b, c)$, where $b \in B$ and $c \in C$[/tex].
The elements in [tex]$B \times C$[/tex] are:
[tex]B \times C = \{&(foam, non$-$fat), (foam, whole),\\&(no$-$foam, non$-$fat), (no$-$foam, whole)\}\end{align*}[/tex]
Thus, the set [tex]$B \times C$[/tex] can be written using roster notation as [tex]\{(foam, non$-$fat),[/tex] (foam, whole), [tex](no$-$foam, non$-$fat), (no$-$foam, whole)\}$[/tex].
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Two coins are tossed and one dice is rolled. Answer the following: What is the probability of having a number greater than 3 on the dice and at most 1 head? Note: Draw a tree diagram to show all the possible outcomes and write the sample space in a sheet of paper to help you answering the question. 0.375 (B) 0.167 0.25 0.75
The probability of having a number greater than 3 on the dice and at most 1 head is 0.375. To solve the problem, draw a tree diagram showing all possible outcomes and write the sample space on paper. The total number of possible outcomes is 24. so, correct option id A
Here is the solution to your problem with all the necessary terms included:When two coins are tossed and one dice is rolled, the probability of having a number greater than 3 on the dice and at most 1 head is 0.375.
To solve the problem, we will have to draw a tree diagram to show all the possible outcomes and write the sample space on a sheet of paper.Let's draw the tree diagram for the given problem statement:
Tree diagram for tossing two coins and rolling one dieThe above tree diagram shows all the possible outcomes for tossing two coins and rolling one die. The sample space for the given problem statement is:Sample space = {HH1, HH2, HH3, HH4, HH5, HH6, HT1, HT2, HT3, HT4, HT5, HT6, TH1, TH2, TH3, TH4, TH5, TH6, TT1, TT2, TT3, TT4, TT5, TT6}
The probability of having a number greater than 3 on the dice and at most 1 head can be calculated by finding the number of favorable outcomes and dividing it by the total number of possible outcomes.
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core: 68.91%,15.16 of 22 points (x) Points: 0 of 1 An automobile purchased for $22,000 is worth $2500 after 5 years. Assuming that the car's value depreciated steadily from year to year, what was it worth at the end of the third year?
The automobile was worth $10,300 at the end of the third year.
To determine the value of the automobile at the end of the third year, we can use the information given regarding its depreciation.
The car was purchased for $22,000 and its value depreciated steadily over the years. We know that after 5 years, the car is worth $2500. This gives us a depreciation of $22,000 - $2500 = $19,500 over a span of 5 years.
To find the annual depreciation, we can divide the total depreciation by the number of years:
Annual depreciation = Total depreciation / Number of years
Annual depreciation = $19,500 / 5
Annual depreciation = $3900
Now, to find the value of the car at the end of the third year, we need to subtract the depreciation for three years from the initial value:
Value at end of third year = Initial value - (Annual depreciation * Number of years)
Value at end of third year = $22,000 - ($3900 * 3)
Value at end of third year = $22,000 - $11,700
Value at end of third year = $10,300
Therefore, the automobile was worth $10,300 at the end of the third year.
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The time (in minutes) until the next bus departs a major bus depot follows a distribution with f(x)=1/20, where x goes from 25 to 45 minutes.
P(25 < x < 55) = _________.
1
0.9
0.8
0.2
0.1
0
Given that the time (in minutes) until the next bus departs a major bus depot follows a distribution with f(x) = 1/20, where x goes from 25 to 45 minutes. Here we need to calculate P(25 < x < 55).
We have to find out the probability of the time until the next bus departs a major bus depot in between 25 and 55 minutes.So we need to find out the probability of P(25 < x < 55)As per the given data f(x) = 1/20 from 25 to 45 minutes.If we calculate the probability of P(25 < x < 55), then we get
P(25 < x < 55) = P(x<55) - P(x<25)
As per the given data, the time distribution is from 25 to 45, so P(x<25) is zero.So we can re-write P(25 < x < 55) as
P(25 < x < 55) = P(x<55) - 0P(x<55) = Probability of the time until the next bus departs a major bus depot in between 25 and 55 minutes
Since the total distribution is from 25 to 45, the maximum possible value is 45. So the probability of P(x<55) can be written asP(x<55) = P(x<=45) = 1Now let's put this value in the above equationP(25 < x < 55) = 1 - 0 = 1
The probability of P(25 < x < 55) is 1. Therefore, the correct option is 1.
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) Make a truth table for the propositional statement P (grp) ^ (¬(p→ q))
Answer:
To make a truth table for the propositional statement P (grp) ^ (¬(p→ q)), we need to list all possible combinations of truth values for the propositional variables p, q, and P (grp), and then evaluate the truth value of the statement for each combination. Here's the truth table:
| p | q | P (grp) | p → q | ¬(p → q) | P (grp) ^ (¬(p → q)) |
|------|------|---------|-------|----------|-----------------------|
| true | true | true | true | false | false |
| true | true | false | true | false | false |
| true | false| true | false | true | true |
| true | false| false | false | true | false |
| false| true | true | true | false | false |
| false| true | false | true | false | false |
| false| false| true | true | false | false |
| false| false| false | true | false | false |
In this truth table, the column labeled "P (grp) ^ (¬(p → q))" shows the truth value of the propositional statement for each combination of truth values for the propositional variables. As we can see, the statement is true only when P (grp) is true and p → q is false, which occurs when p is true and q is false.
4. (3pts) A curve \( y=g(x) \) satisfies the property: every perpendicular line to the curve crosses through \( (0,1) \). Find an ODE for the curve.
We have obtained the ODE for the curve \( y = g(x) \):
[tex]\[ (g'(x))^2 = -1 + xg''(x) \][/tex]
-Let's consider a point \( (x, g(x)) \) on the curve \( y = g(x) \). We want to find an ordinary differential equation (ODE) that characterizes this curve.
The property given states that every perpendicular line to the curve crosses through \( (0, 1) \). This means that the line perpendicular to the curve at \( (x, g(x)) \) has a slope of \( -\frac{1}{g'(x)} \) and passes through the point \( (0, 1) \).
Using the point-slope form of a line, we can write the equation of this perpendicular line as:
[tex]\[ y - 1 = -\frac{1}{g'(x)}(x - 0) \][/tex]
Simplifying, we get:
[tex]\[ y - 1 = -\frac{x}{g'(x)} \][/tex]
Now, let's differentiate both sides of the equation with respect to \( x \):
[tex]\[ \frac{dy}{dx} = -\frac{1}{g'(x)} + \frac{xg''(x)}{(g'(x))^2} \][/tex]
We want to express this equation in terms of \( x \) and \( y \) without involving the second derivative[tex]\( g''(x) \)[/tex]. To do that, we can rewrite \( \frac{dy}{dx} \) in terms of \( y \) using the relation \( y = g(x) \):
[tex]\[ \frac{dy}{dx} = g'(x) \][/tex]
Substituting this back into the equation, we have:
[tex]\[ g'(x) = -\frac{1}{g'(x)} + \frac{xg''(x)}{(g'(x))^2} \][/tex]
Multiplying through by [tex]\( (g'(x))^2 \),[/tex] we get:
[tex]\[ (g'(x))^2 = -1 + xg''(x) \][/tex]
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VI. Urn I has 4 red balls and 6 black; Urn II has 7 red and 4 black. A ball is chosen a random from Urn I and put into Urn II. A second ball is chosen at random from Urn Find 1. the probability that the second ball is red and
2. The probability that the first ball was red given that the second ball was red.
The probability that the first ball was red given that the second ball was red is 4/9.
The probability that the second ball is red
The probability that the second ball from urn II is red can be found out as follows:
First, the probability of picking a red ball from urn I is 4/10. Second, we put that red ball into urn II, which originally has 7 red and 4 black balls. Thus, the total number of balls in urn II is now 12, out of which 8 are red.
Thus, the probability of picking a red ball from urn II is 8/12 or 2/3.Therefore, the probability that the second ball is red = probability of picking a red ball from urn I × probability of picking a red ball from urn II= (4/10) × (2/3) = 8/30 or 4/15.
The probability that the first ball was red given that the second ball was red
The probability that the first ball was red given that the second ball was red can be found out using Bayes' theorem.
Let A and B be events such that A is the event that the first ball is red and B is the event that the second ball is red.
Then, Bayes' theorem states that:P(A|B) = P(B|A) P(A) / P(B)where P(A) is the prior probability of A, P(B|A) is the conditional probability of B given A, and P(B) is the marginal probability of B. We have already calculated P(B) in part (1) as 4/15.
Now we need to calculate P(A|B) and P(B|A).P(B|A) = probability of picking a red ball from urn II after putting a red ball from urn I into it= 8/12 or 2/3P(A) = probability of picking a red ball from urn I= 4/10 or 2/5Thus,P(A|B) = P(B|A) P(A) / P(B)= (2/3) × (2/5) / (4/15)= 4/9
Therefore, the probability that the first ball was red given that the second ball was red is 4/9.
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. Factor The Operator And Find The General Solution To Utt−3uxt+2uzx=0
To solve the given partial differential equation, we can start by factoring the operator. The equation can be written as:
(u_tt - 3u_xt + 2u_zx) = 0
Factoring the operator, we have:
(u_t - u_x)(u_t - 2u_z) = 0
Now, we have two separate equations:
1. u_t - u_x = 0
2. u_t - 2u_z = 0
Let's solve these equations one by one.
1. u_t - u_x = 0:
This is a first-order linear partial differential equation. We can use the method of characteristics to solve it. Let's introduce a characteristic parameter s such that dx/ds = -1 and dt/ds = 1. Integrating these equations, we get x = -s + a and t = s + b, where a and b are constants.
Now, we express u in terms of s:
u(x, t) = f(s) = f(-s + a) = f(x + t - b)
So, the general solution to the equation u_t - u_x = 0 is u(x, t) = f(x + t - b), where f is an arbitrary function.
2. u_t - 2u_z = 0:
This is another first-order linear partial differential equation. Again, we can use the method of characteristics. Let's introduce a characteristic parameter r such that dz/dr = 2 and dt/dr = 1. Integrating these equations, we get z = 2r + c and t = r + d, where c and d are constants.
Now, we express u in terms of r:
u(z, t) = g(r) = g(2r + c) = g(z/2 + t - d)
So, the general solution to the equation u_t - 2u_z = 0 is u(z, t) = g(z/2 + t - d), where g is an arbitrary function.
Combining the solutions of both equations, we have:
u(x, t, z) = f(x + t - b) + g(z/2 + t - d)
where f and g are arbitrary functions.
This is the general solution to the given partial differential equation.
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Over real numbers the following statement is True or False? (Exists y) (Forall x)(x y=x) True False
The statement "There (Exists y) (For all x) where (xy=x)" is False over real numbers.
Let us look at the reason why is it false.
Let's assume that both x and y are non-zero values, which means both have a real number value other than 0.
Since the equation says xy = x, we can cancel out the x term on both sides by dividing both right and left side with x, which results in y = 1.
So, for any non-zero x value, y equals 1.
However, this is only true for one specific value of y, that is when both x and y are equal to 1, which is not allowed in an "exists for all" statement.
Hence, the statement is False.
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Let f(n)=n 2
and g(n)=n log 3
(10)
. Which holds: f(n)=O(g(n))
g(n)=O(f(n))
f(n)=O(g(n)) and g(n)=O(f(n))
Let f(n) = n2 and g(n) = n log3(10).The big-O notation defines the upper bound of a function, indicating how rapidly a function grows asymptotically. The statement "f(n) = O(g(n))" means that f(n) grows no more quickly than g(n).
Solution:
f(n) = n2and g(n) = nlog3(10)
We can show f(n) = O(g(n)) if and only if there are positive constants c and n0 such that |f(n)| <= c * |g(n)| for all n > n0To prove the given statement f(n) = O(g(n)), we need to show that there exist two positive constants c and n0 such that f(n) <= c * g(n) for all n >= n0Then we have f(n) = n2and g(n) = nlog3(10)Let c = 1 and n0 = 1Thus f(n) <= c * g(n) for all n >= n0As n2 <= nlog3(10) for n > 1Therefore, f(n) = O(g(n))
Hence, the correct option is f(n) = O(g(n)).
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This laboratory experiment requires the simultaneous solving of two equations each containing two unknown variables. There are two mathematical methods to do this. One: rearrange one equation to isolate one variable (eg, AH = ...), then substitute that variable into the second equation. Method two: subtract the two equations from each other which cancels out one variable. Prepare by practicing with the data provided below and use equation 3 to solve for AH, and AS. Temperature 1 = 15K Temperature 2 = 75 K AG= - 35.25 kJ/mol AG= -28.37 kJ/mol
The values for AH and AS using the given data and the two methods described are:
AH = -36.4 kJ/mol.
AS = -0.115 kJ/(mol*K),
How to solve for AH and As using the two methods?We shall apply the two provided methods to solve for AH and AS on the provided data.
Method One:
We'll use the Gibbs free energy equation:
ΔG = ΔH - TΔS
where:
ΔG = change in Gibbs free energy,
ΔH = change in enthalpy,
ΔS = change in entropy,
T= temperature in Kelvin.
Given:
T1 = 15 K
T2 = 75 K
ΔG1 = -35.25 kJ/mol
ΔG2 = -28.37 kJ/mol
We set up two equations using the provided data:
Equation 1: ΔG1 = ΔH - T1ΔS
Equation 2: ΔG2 = ΔH - T2ΔS
Method Two:
We subtract Equation 1 from Equation 2 to eliminate ΔH:
ΔG2 - ΔG1 = (ΔH - T2ΔS) - (ΔH - T1ΔS)
ΔG2 - ΔG1 = -T2ΔS + T1ΔS
ΔG2 - ΔG1 = (T1 - T2)ΔS
Now we have two equations:
Equation 3: ΔG1 = ΔH - T1ΔS
Equation 4: ΔG2 - ΔG1 = (T1 - T2)ΔS
Next, we solve these equations to find the values of AH and AS.
Plugging in the values from the given data into Equation 3:
-35.25 kJ/mol = AH - 15K * AS
AH = -35.25 kJ/mol + 15K * AS
Put the values from the given data into Equation 4:
(-28.37 kJ/mol) - (-35.25 kJ/mol) = (15K - 75K) * AS
6.88 kJ/mol = -60K * AS
So, we got two equations:
Equation 5: AH = -35.25 kJ/mol + 15K * AS
Equation 6: 6.88 kJ/mol = -60K * AS
We can solve these two equations simultaneously to find the values of AH and AS.
Substituting Equation 6 into Equation 5:
AH = -35.25 kJ/mol + 15K * (6.88 kJ/mol / -60K)
AH = -35.25 kJ/mol - 1.15 kJ/mol
AH = -36.4 kJ/mol
Put the value of AH into Equation 6:
6.88 kJ/mol = -60K * AS
AS = 6.88 kJ/mol / (-60K)
AS = -0.115 kJ/(mol*K)
So, AH = -36.4 kJ/mol and AS = -0.115 kJ/(mol*K).
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. A two-sided test will reject the null hypothesis at the .05
level of significance when the value of the population mean falls
outside the 95% interval. A. True B. False C. None of the above
B. False
A two-sided test will reject the null hypothesis at the 0.05 level of significance when the value of the population mean falls outside the critical region defined by the rejection region. The rejection region is determined based on the test statistic and the desired level of significance. The 95% confidence interval, on the other hand, provides an interval estimate for the population mean and is not directly related to the rejection of the null hypothesis in a two-sided test.
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An urn contains four balls numbered 1, 2, 3, and 4. If two balls are drawn from the urn at random (that is, each pair has the same chance of being selected) and Z is the sum of the numbers on the two balls drawn, find (a) the probability mass function of Z and draw its graph; (b) the cumulative distribution function of Z and draw its graph.
The probability mass function (PMF) of Z denotes the likelihood of the occurrence of each value of Z. We can find PMF by listing all possible values of Z and then determining the probability of each value. The outcomes of drawing two balls can be listed in a table.
For each value of the sum of the balls (Z), the table shows the number of ways that sum can be obtained, the probability of getting that sum, and the value of the probability mass function of Z. Balls can be drawn in any order, but the order doesn't matter. We have given an urn that contains four balls numbered 1, 2, 3, and 4. The total number of ways to draw any two balls from an urn of 4 balls is: 4C2 = 6 ways. The ways of getting Z=2, Z=3, Z=4, Z=5, Z=6, and Z=8 are shown in the table below. The PMF of Z can be found by using the formula given below for each value of Z:pmf(z) = (number of ways to get Z) / (total number of ways to draw any two balls)For example, the pmf of Z=2 is pmf(2) = 1/6, as there is only one way to get Z=2, namely by drawing balls 1 and 1. The graph of the PMF of Z is shown below. Cumulative distribution function (CDF) of Z denotes the probability that Z is less than or equal to some value z, i.e.,F(z) = P(Z ≤ z)We can find CDF by summing the probabilities of all the values less than or equal to z. The CDF of Z can be found using the formula given below:F(z) = P(Z ≤ z) = Σpmf(k) for k ≤ z.For example, F(3) = P(Z ≤ 3) = pmf(2) + pmf(3) = 1/6 + 2/6 = 1/2.
We can conclude that the probability mass function of Z gives the probability of each value of Z. On the other hand, the cumulative distribution function of Z gives the probability that Z is less than or equal to some value z. The graphs of both the PMF and CDF are shown above. The PMF is a bar graph, whereas the CDF is a step function.
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∣Ψ(x,t)∣ 2
=f(x)+g(x)cos3ωt and expand f(x) and g(x) in terms of sinx and sin2x. 4. Use Matlab to plot the following functions versus x, for 0≤x≤π : - ∣Ψ(x,t)∣ 2
when t=0 - ∣Ψ(x,t)∣ 2
when 3ωt=π/2 - ∣Ψ(x,t)∣ 2
when 3ωt=π (and print them out and hand them in.)
The probability density, ∣Ψ(x,t)∣ 2 for a quantum mechanical wave function, Ψ(x,t) is equal to[tex]f(x) + g(x) cos 3ωt.[/tex] We have to expand f(x) and g(x) in terms of sin x and sin 2x.How to expand f(x) and g(x) in terms of sinx and sin2x.
Consider the function f(x), which can be written as:[tex]f(x) = A sin x + B sin 2x[/tex] Using trigonometric identities, we can rewrite sin 2x in terms of sin x as: sin 2x = 2 sin x cos x. Therefore, f(x) can be rewritten as[tex]:f(x) = A sin x + 2B sin x cos x[/tex] Now, consider the function g(x), which can be written as: [tex]g(x) = C sin x + D sin 2x[/tex] Similar to the previous case, we can rewrite sin 2x in terms of sin x as: sin 2x = 2 sin x cos x.
Therefore, g(x) can be rewritten as: g(x) = C sin x + 2D sin x cos x Therefore, the probability density, ∣Ψ(x,t)∣ 2, can be written as follows[tex]:∣Ψ(x,t)∣ 2 = f(x) + g(x) cos 3ωt∣Ψ(x,t)∣ 2 = A sin x + 2B sin x cos x[/tex]To plot the functions.
We can use Matlab with the following code:clc; clear all; close all; x = linspace(0,pi,1000); [tex]A = 3; B = 2; C = 1; D = 4; Psi1 = (A+C).*sin(x) + 2.*(B+D).*sin(x).*cos(x); Psi2 = (A+C.*cos(pi/6)).*sin(x) + 2.*(B+2*D.*cos(pi/6)).*sin(x).*cos(x); Psi3 = (A+C.*cos(pi/3)).*sin(x) + 2.*(B+2*D.*cos(pi/3)).*sin(x).*cos(x); plot(x,Psi1,x,Psi2,x,Psi3) xlabel('x') ylabel('\Psi(x,t)')[/tex] title('Probability density function') legend[tex]('\Psi(x,t) when t = 0','\Psi(x,t) when 3\omegat = \pi/6','\Psi(x,t) when 3\omegat = \pi')[/tex] The plotted functions are attached below:Figure: Probability density functions of ∣Ψ(x,t)∣ 2 when [tex]t=0, 3ωt=π/6 and 3ωt=π.[/tex]..
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