The finite difference approximation of u tt−u x =0 in the implicit method used to solve parabolic PDEs is \ u_i^{n-1} = u_i^n + \frac{\Delta t}{\Delta x}(u_{i+1}^n - u_i^n)
PDE: u_tt - u_x = 0
The parabolic PDEs can be solved numerically using the implicit method.
The implicit method makes use of the backward difference formula for time derivative and the central difference formula for spatial derivative.
Finite difference approximation of u_tt - u_x = 0
In the implicit method, the backward difference formula for time derivative and the central difference formula for spatial derivative is used as shown below:(u_i^n - u_i^{n-1})/\Delta t - (u_{i+1}^n - u_i^n)/\Delta x = 0
Multiplying through by -\Delta t gives:\ u_i^{n-1} - u_i^n = \frac{\Delta t}{\Delta x}(u_{i+1}^n - u_i^n)
Rearranging gives:\ u_i^{n-1} = u_i^n + \frac{\Delta t}{\Delta x}(u_{i+1}^n - u_i^n)This is the finite difference equation.
learn more about parabolic from given link
https://brainly.com/question/13244761
#SPJ11
3. Q and R are independent events. If P(Q) = 0.8 and P(R) = 0.2, find P(Q and R).
1
0.16
0.84
Answer:
0.16
Step-by-step explanation:
P(Q and R) = P(Q) * P(R) (since Q and R are independent)
= 0.8 * 0.2
= 0.16
How do you know what method (SSS, SAS, ASA, AAS) to use when proving triangle congruence?
Answer:
Two triangles are said to be congruent if they are exactly identical. We know that a triangle has three angles and three sides. So, two triangles have six angles and six sides. If we can prove the any corresponding three of them of both triangles equal under certain rules, the triangles are congruent to each other. These rules are called axioms.
The method you will use depends on the information you are given about the triangles.
--> SSS(Side-Side-Side): If you know that all three sides of a triangle are congruent to the corresponding sides of another triangle, then the two triangles are congruent.
--> SAS(Side-Angle-Side): If you know that two sides and the angle between those sides are equal to the another corresponding two sides and the angle between the two sides of another triangle, then you say that the triangles are congruent by SAS axiom.
--> ASA(Angle-Side-Angle): If you know that the two angles and the side between them are equal to the two corresponding angles and the side between those angles of another triangle are equal, you may say that the triangles are congruent by ASA axiom.
--> AAS(Angle-Angle-Side): This method is similar to the ASA axiom, but they are not same. In AAS axiom also you need to have two corresponding angles and a side of a triangle equal, but they should be in angle-angle-side order.
--> RHS(Right-Hypotenuse-Side) or HL(Hypotenuse-Leg): If hypotenuses and any two sides of two right triangles are equal, the triangles are said to be congruent by RHS axiom. You can only test this rule for the right triangles.
Answer:
So, there are four ways to figure out if two triangles are the same shape and size. One way is called SSS, which means all three sides of one triangle match up with the corresponding sides on the other triangle. Another way is called AAS, where two angles and one side of one triangle match two angles and one side of the other triangle. Then there's SAS, where two sides and the angle between them match up with the same parts on the other triangle. Finally, there's ASA, where two angles and a side in between them match up with the same parts on the other triangle.
DFC Company has recorded the past years sales for the company:
Year(t)
Sales(x)
(in Million Pesos)
2011(1)
2012(2)
2013(3)
2014(4)
2015(5)
2016(6)
2017(7)
2018(8)
2019(9)
2020(10)
219
224
268
272
253
284
254
278
282
298
a. Use the naïve model. Compute for MAE and MSE
b. Use a three period moving average. Compute for the MAE and MSE
c. Use the simple exponential smoothing to make a forecasting table. Compute the MAE and MSE of the forecasts. Alpha = 0. 1
d. Use the least square method to make the forecasting table. Compute the MAE and MSE
By calculating the MAE and MSE for each forecasting method, we can assess their accuracy in predicting sales values for DFC Company.
a. Naïve Model:
To compute the MAE (Mean Absolute Error) and MSE (Mean Squared Error) using the naïve model, we need to compare the actual sales values with the sales values from the previous year.
MAE = (|x₁ - x₀| + |x₂ - x₁| + ... + |xₙ - xₙ₋₁|) / n
MSE = ((x₁ - x₀)² + (x₂ - x₁)² + ... + (xₙ - xₙ₋₁)²) / n
Using the given sales data:
MAE = (|224 - 219| + |268 - 224| + ... + |298 - 282|) / 9
MSE = ((224 - 219)² + (268 - 224)² + ... + (298 - 282)²) / 9
b. Three Period Moving Average:
To compute the MAE and MSE using the three period moving average, we need to calculate the average of the sales values from the previous three years and compare them with the actual sales values.
MAE = (|average(219, 224, 268) - 224| + |average(224, 268, 272) - 268| + ... + |average(282, 298, 298) - 298|) / 8
MSE = ((average(219, 224, 268) - 224)² + (average(224, 268, 272) - 268)² + ... + (average(282, 298, 298) - 298)²) / 8
c. Simple Exponential Smoothing:
To make a forecasting table using simple exponential smoothing with alpha = 0.1, we need to calculate the forecasted values using the formula:
Forecast(t) = alpha * Actual(t) + (1 - alpha) * Forecast(t-1)
Then, we can compute the MAE and MSE of the forecasts by comparing them with the actual sales values.
MAE = (|Forecast(2) - x₂| + |Forecast(3) - x₃| + ... + |Forecast(10) - x₁₀|) / 8
MSE = ((Forecast(2) - x₂)² + (Forecast(3) - x₃)² + ... + (Forecast(10) - x₁₀)²) / 8
d. Least Square Method:
To make a forecasting table using the least square method, we need to fit a linear regression model to the sales data and use it to predict the sales values for the future years. Then, we can compute the MAE and MSE of the forecasts by comparing them with the actual sales values.
Note: The specific steps for the least square method are not provided, so I cannot provide the exact calculations for this method.
By computing the MAE and MSE for each forecasting method, we can compare their accuracies in predicting the sales values.
Learn more about forecasting method here :-
https://brainly.com/question/32131395
#SPJ11
Does anyone know this answer? if anyone can answer i’ll be so thankful.
find the mean of the following data set made up of algebra quiz scores round your answer to the nearest tenth place 0,2,3,5,4,2,1
Answer:
2.4
explanation:
first, you add all the values, and you get 17.
next, you divide by 7, because there are 7 values in the data set.
17/7 = 2.429, rounded to the tenths place is 2.4
Which diagram represents the postulate that states exactly one line exists between any two points?
In the realm of geometry, lines and points are foundational, undefined terms. The postulate asserting the existence of exactly one line between any two points is best represented by option (c), where a straight line passes through points A and B, affirming the fundamental concept that two points uniquely determine a line.
The correct answer is option C.
In geometry, the foundational concepts of lines and points are considered undefined terms because they are fundamental and do not require further explanation or definition. These terms serve as the building blocks for developing geometric principles and theorems.
One crucial postulate in geometry states that "Exactly one line exists between any two points." This postulate essentially means that when you have two distinct points, there is one and only one line that can be drawn through those points.
To illustrate this postulate, we can examine the given options. The diagram that best represents this postulate is option (c), where there is a straight line passing through points A and B. This choice aligns with the postulate's assertion that a single line must exist between any two points.
Therefore, among the provided options, only option (c) accurately depicts the postulate. It visually reinforces the idea that when you have two distinct points, they uniquely determine a single straight line passing through them.
For more such information on: postulate
https://brainly.com/question/12590465
#SPJ2
Una persona vuela un papalote en forma de mariposa se ha estimado que el largo de la cuerda es de 50 m y forma un ángulo de 60 con el suelo a que altura vuela el papalote
El papalote vuela a una altura aproximada de 43.3 metros.
Para determinar la altura a la que vuela el papalote en forma de mariposa, podemos utilizar la trigonometría básica. Dado que se nos proporciona el largo de la cuerda (50 m) y el ángulo que forma con el suelo (60 grados), podemos utilizar la función trigonométrica del seno.
El seno de un ángulo se define como la relación entre el cateto opuesto y la hipotenusa de un triángulo rectángulo. En este caso, la altura a la que vuela el papalote es el cateto opuesto y la longitud de la cuerda es la hipotenusa.
Aplicando la fórmula del seno:
sen(60 grados) = altura / 50 m
Despejando la altura:
altura = sen(60 grados) * 50 m
El seno de 60 grados es √3/2, por lo que podemos sustituirlo en la ecuación:
altura = (√3/2) * 50 m
Realizando la operación:
altura ≈ (1.732/2) * 50 m
altura ≈ 0.866 * 50 m
altura ≈ 43.3 m
For more such questions on altura
https://brainly.com/question/31544891
#SPJ8
N
Select the correct answer from the drop-down menu.
Which equation satisfies all three pairs of a and b values listed in the table?
a b
0-10
1
-7
2 -4
The equation is?
Answer:
An equation that satisfies all three pairs of a and b values listed in the table include the following: C. 3a - b = 10
Step-by-step explanation:
How to determine an equation that satisfies all three pairs of a and b values listed in the table?
In order to determine an equation that satisfies all three pairs of a and b values listed in the table, we would substitute each of the numerical values corresponding to each variable into the given equations and then evaluate as follows;
a - 3b = 10
0 - 3(-10) = 30 (False).
3a + b = 10
3(0) - 10 = -10 (False).
3a - b = 10
3(0) - (-10)
0 + 10 = 10 (True).
3a - b = 10
3(1) - (-7)
3 + 7 = 10 (True).
3a - b = 10
3(2) - (-4)
6 + 4 = 10 (True)
Read more on equation here: brainly.com/question/2451321
#SPJ1
Complete Question:
Which equation satisfies all three pairs of a and b values listed in the table?
a b
0 -10
1 -7
2 -4
The equation is?
A.) a-3b=10
B.) 3a+b=10
C.) 3a-b=10
D.) a+3b=10
Your car starting seems to depend on the temperature. Each year, the car does not start 4% of the time. When the car does not start, the probability that the temperature is above 30C or below −15C is 85%. Those temperatures tabove 30C and below −15C ) occur in about 24 of 365 days each year. Use the Bayesian theorem to determine the probability that the car will not start given the temperature being −22C. Express your answer as a proportion rounded to four dedmal places. P(A∣B)= P(B)
P(B∣A)∗P(A)
The probability that the car will not start given the temperature being -22C is approximately 0, thus not possible.
To solve this problem, we can use Bayes' theorem. We are given the following probabilities:
P(T) = 0.065 (probability of temperature)
P(C) = 0.04 (probability that the car does not start)
P(T|C) = 0.85 (probability of temperature given that the car does not start)
We need to determine P(C|T=-22).
Let's calculate P(T) and P(T|C) first.
P(T) = P(T and C') + P(T and C)
P(T) = P(T|C') * P(C') + P(T|C) * P(C)
P(T) = (1 - P(T|C)) * (1 - P(C)) + P(T|C) * P(C)
P(T) = (1 - 0.85) * (1 - 0.04) + 0.85 * 0.04
P(T) = 0.0914
P(T|C) = 0.85
Next, we need to calculate P(C|T=-22).
P(T=-22|C) = 1 - P(T>30 or T<-15|C)
P(T>30 or T<-15|C) = P(T>30|C) + P(T<-15|C) - P(T>30 and T<-15|C)
P(T>30|C) = 8/365
P(T<-15|C) = 16/365
P(T>30 and T<-15|C) = 0 (because the two events are mutually exclusive)
P(T>30 or T<-15|C) = 8/365 + 16/365 - 0 = 24/365
P(T=-22|C) = 1 - 24/365 = 341/365
P(T=-22) = P(T=-22|C') * P(C') + P(T=-22|C) * P(C)
P(T=-22) = 1/3 * (1 - 0.04) + 0
P(T=-22) = 0.3067
Finally, we can calculate P(C|T).
P(C|T=-22) = P(T=-22|C) * P(C) / P(T=-22)
P(C|T=-22) = (341/365) * 0.04 / 0.3067 ≈ 0
Therefore, the probability that the car will not start given the temperature being -22C is approximately 0, rounded to four decimal places.
Learn more about probability
https://brainly.com/question/31828911
#SPJ11
The probability that the car will not start given the temperature being −22C is 16.67 percent.
The car does not start 4% of the time each year, so there is a 96% chance of it starting.
There are 365 days in a year, so the likelihood of the car not starting is 0.04 * 365 = 14.6 days per year.
On these 14.6 days per year, the likelihood that the temperature is above 30°C or below -15°C is 85 percent. This suggests that out of the 14.6 days when the car does not start, roughly 12.41 of them (85 percent) are on days when the temperature is above 30°C or below -15°C. That leaves 2.19 days when the temperature is between -15°C and 30°C.
On these days, there is a 4% probability that the car will not start if the temperature is between -15°C and 30°C.
To calculate the probability that the car will not start given that the temperature is -22°C:
P(not starting | temperature=-22) = P(temperature=-22 | not starting) * P(not starting) / P(temperature=-22)
Plugging in the values:
P(not starting | temperature=-22) = 0.04 * (2.19 / 365) / 0.00242541
Simplifying the calculation:
P(not starting | temperature=-22) ≈ 0.1667 or 16.67 percent.
Rounding this figure to four decimal places, we get 0.1667 as the final solution.
Note: The result should be rounded to the appropriate number of decimal places based on the level of precision desired.
Learn more about Bayesian Theorem
https://brainly.com/question/29107816
#SPJ11
Given the following linear ODE: y' - y = x; y(0) = 0. Then a solution of it is y = -1 + ex y = -x-1+e-* y = -x-1+ e* None of the mentioned
Correct option is y = -x-1 + e^x.
The given linear ODE:
y' - y = x; y(0) = 0 can be solved by the following method:
We first need to find the integrating factor of the given differential equation. We will find it using the following formula:
IF = e^integral of P(x) dx
Where P(x) is the coefficient of y (the function multiplying y).
In the given differential equation, P(x) = -1, hence we have,IF = e^-x We multiply this IF to both sides of the equation. This will reduce the left side to a product of the derivative of y and IF as shown below:
e^-x y' - e^-x y = xe^-x We can simplify the left side by applying the product rule of differentiation as shown below:
d/dx (e^-x y) = xe^-x We can integrate both sides to obtain the solution of the differential equation. The solution to the given linear ODE:y' - y = x; y(0) = 0 is:y = -x-1 + e^x + C where C is the constant of integration. Substituting y(0) = 0, we get,0 = -1 + 1 + C
Therefore, C = 0
Hence, the solution to the given differential equation: y = -x-1 + e^x
So, the correct option is y = -x-1 + e^x.
Learn more about integrating factor from the link :
https://brainly.com/question/30426977
#SPJ11
What are the increasing intervals of the graph -2x^3-3x^2+432x+1
Answer:
decreasing: (-∞, -9) ∪ (8, ∞)
increasing: (-9, 8)
Step-by-step explanation:
You want the intervals where the function f(x) = -2x³ -3x² +432x +1 is increasing and decreasing.
DerivativeThe slope of the graph is given by its derivative:
f'(x) = -6x² -6x +432 = -6(x +1/2)² +433.5
Critical pointsThe slope is zero where ...
-6(x +1/2)² = -433.5
(x +1/2)² = 72.25
x +1/2 = ±8 1/2
x = -9, +8
IntervalsThe graph will be decreasing for x < -9 and x > 8, since the leading coefficient is negative. It will be increasing between those values:
decreasing: (-∞, -9) ∪ (8, ∞)
increasing: (-9, 8)
__
Additional comment
A cubic (or any odd-degree) function with a positive leading coefficient generally increases over its domain, with a possible flat spot or interval of decrease. When the leading coefficient is negative, the function is mostly decreasing, with a possible interval of increase, as here.
<95141404393>
Determine, without graphing, whether the given quadratic function has a maximum value or a minimum value and then find the value. f(x)=−3x 2
+30x−2 Does the quadratic function f have a minimum value or a maximum value? The function f has a minimum value The function fhas a maximum value: What is this minimum or maximum value? (Swinplify your answer.)
The quadratic function f has a maximum value, and this maximum value is 73.
The given quadratic function is f(x) = -3x² + 30x - 2. We can determine whether it has a minimum value or a maximum value by examining the coefficient of the x² term, which is -3.
Since the coefficient of the x² term (-3) is negative, the quadratic function f(x) = -3x² + 30x - 2 will have a maximum value.
To find the maximum value, we can use the formula x = -b/(2a), where a and b are the coefficients of the quadratic function. In this case, a = -3 and b = 30.
x = -30/(2*(-3)) = -30/(-6) = 5
Now, substitute this value of x back into the quadratic function to find the maximum value:
f(5) = -3(5)² + 30(5) - 2
= -3(25) + 150 - 2
= -75 + 150 - 2
= 73
Therefore, the quadratic function f(x) = -3x² + 30x - 2 has a maximum value of 73.
In summary, the quadratic function f has a maximum value, and this maximum value is 73.
Learn more about quadratic function here
https://brainly.com/question/25841119
#SPJ11
8. Prove that if n is a positive integer, then n is odd if and only if 5n+ 6 is odd.
Since both implications are true, we might conclude that if n is a positive integer, then n is odd if and only if 5n + 6 is odd.
To prove that if n is a positive integer, then n is odd if and only if 5n + 6 is odd, let's begin by using the logical equivalence `p if and only if q = (p => q) ^ (q => p)`.
Assuming `n` is a positive integer, we are to prove that `n` is odd if and only if `5n + 6` is odd.i.e, we are to prove the two implications:
`n is odd => 5n + 6 is odd` and `5n + 6 is odd => n is odd`.
Proof that `n is odd => 5n + 6 is odd`:
Assume `n` is an odd positive integer. By definition, an odd integer can be expressed as `2k + 1` for some integer `k`.Therefore, we can express `n` as `n = 2k + 1`.Substituting `n = 2k + 1` into the expression for `5n + 6`, we have: `5n + 6 = 5(2k + 1) + 6 = 10k + 11`.Since `10k` is even for any integer `k`, then `10k + 11` is odd for any integer `k`.Therefore, `5n + 6` is odd if `n` is odd. Hence, the first implication is proved. Proof that `5n + 6 is odd => n is odd`:
Assume `5n + 6` is odd. By definition, an odd integer can be expressed as `2k + 1` for some integer `k`.Therefore, we can express `5n + 6` as `5n + 6 = 2k + 1` for some integer `k`.Solving for `n` we have: `5n = 2k - 5` and `n = (2k - 5) / 5`.Since `2k - 5` is odd, it follows that `2k - 5` must be of the form `2m + 1` for some integer `m`. Therefore, `n = (2m + 1) / 5`.If `n` is an integer, then `(2m + 1)` must be divisible by `5`. Since `2m` is even, it follows that `2m + 1` is odd. Therefore, `(2m + 1)` is not divisible by `2` and so it must be divisible by `5`. Thus, `n` must be odd, and the second implication is proved.
Since both implications are true, we can conclude that if n is a positive integer, then n is odd if and only if 5n + 6 is odd.
Learn more about positive integer at https://brainly.com/question/18380011
#SPJ11
A red die and a blue die are rolled. You win or lose money depending on the sum of the values of the two dice. If the sum is 5 or 10 , you win $5. If the sum is 4,8 , or 11 , you win $1. If the sum is any other value (2,3,6,7,9, or 12), you lose $3. Let X be a random variable that corresponds to your net winnings in dollars. What is the expected value of X ? E[X]=
The expected value of the random variable X, representing the outcome of a dice game, is calculated to be $4/9. This represents the average value or long-term average outcome of X.
The expected value of a random variable X represents the average value or the long-term average outcome of X. To find the expected value of X in this scenario, we need to consider the probabilities of each outcome and multiply them by their respective values.
In this case, we have three possible outcomes: winning $5, winning $1, and losing $3. Let's calculate the probabilities for each outcome:
1. Winning $5: The sum of the two dice can be 5 in two ways: (1, 4) and (4, 1). Since each die has 6 possible outcomes, the total number of outcomes is 6 * 6 = 36. Therefore, the probability of getting a sum of 5 is 2/36 = 1/18.
2. Winning $1: The sum of the two dice can be 4, 8, or 11. We can obtain a sum of 4 in three ways: (1, 3), (2, 2), and (3, 1). The sum of 8 can be obtained in five ways: (2, 6), (3, 5), (4, 4), (5, 3), and (6, 2). Finally, the sum of 11 can be obtained in two ways: (5, 6) and (6, 5). So, the total number of outcomes for winning $1 is 3 + 5 + 2 = 10. Therefore, the probability of getting a sum of 4, 8, or 11 is 10/36 = 5/18.
3. Losing $3: The sum of the two dice can be any other value (2, 3, 6, 7, 9, or 12). We have already accounted for the outcomes that result in winning, so the remaining outcomes will result in losing $3. Since there are 36 possible outcomes in total and we have accounted for 2 + 10 = 12 outcomes that result in winning, the number of outcomes that result in losing $3 is 36 - 12 = 24. Therefore, the probability of losing $3 is 24/36 = 2/3.
Now, let's calculate the expected value using the probabilities and values for each outcome:
E[X] = (Probability of winning $5 * $5) + (Probability of winning $1 * $1) + (Probability of losing $3 * -$3)
= (1/18 * $5) + (5/18 * $1) + (2/3 * -$3)
Simplifying this equation, we get:
E[X] = $5/18 + $5/18 - $2
= ($5 + $5 - $2)/18
= $8/18
= $4/9
Therefore, the expected value of X is $4/9.
To know more about probability, refer to the link below:
https://brainly.com/question/11034287#
#SPJ11
Derivative this (1) (−5x2−7x)e^4x
Answer:
Step-by-step explanation:
f(x) = (−5x2−7x)e^4x
Using the product rule:
f'(x) = (−5x2−7x)* 4e^4x + e^4x*(-10x - 7)
= e^4x(4(−5x2−7x) - 10x - 7)
= e^4x(-20x^2 - 28x - 10x - 7)
= e^4x(-20x^2 - 38x - 7)
consider the following sets : A = {10, 20, 30, 40, 50} B = {30, 40, 50, 60, 70, 80, 90} What is the value of n(A)?
The value of n(A) is the number of elements in set A. In this case, set A contains five elements, namely 10, 20, 30, 40, and 50. Therefore, the value of n(A) is 5.
The notation n(A) is used to denote the cardinality of set A. The cardinality of a set is the number of distinct elements in the set. For example, if set A contains three elements, then its cardinality is 3.
The cardinality of a set can be determined by counting the number of elements in the set. If a set contains a finite number of elements, then its cardinality is a natural number. If a set contains an infinite number of elements, then its cardinality is an infinite cardinal number.
The concept of cardinality is important in set theory because it allows us to compare the sizes of different sets. For example, if set A has a greater cardinality than set B, then we can say that A is "larger" than B in some sense.
for such more question on elements
https://brainly.com/question/25916838
#SPJ8
Evaluate the following MATLAB functions and show your answers.
(i) x = [2, 9, 4; 6, 8, 5] max(x)
(ii) x = [2, 9, 4; 6, 8, 5] [a,b] = max(x)
(iii) x = [2, 9, 4; 6, 8, 5] mean(x)
(iv) x = [2, 9, 4; 6, 8, 5; 3, 7, 1] median(x)
(v) x = [2, 9, 4; 6, 8, 5] cumprod(x)
(i) max(x) = 9
(ii) [a, b] = max(x) -> a = [6, 9, 5], b = [2, 1, 2]
(iii) mean(x) ≈ 5.6667
(iv) median(x) = 5
(v) cumprod(x) = [2, 18, 72; 12, 96, 480]
What is the output of `sqrt(16)` in MATLAB?Sure! Let's evaluate each MATLAB function one by one:
(i) x = [2, 9, 4; 6, 8, 5]
max(x)
The function `max(x)` returns the maximum value of the elements in the matrix `x`. In this case, the matrix `x` is:
x = [2, 9, 4; 6, 8, 5]
Evaluating `max(x)` will give us the maximum value, which is 9.
Answer: max(x) = 9
(ii) x = [2, 9, 4; 6, 8, 5]
[a, b] = max(x)
The function `max(x)` with two output arguments returns both the maximum values and their corresponding indices. In this case, the matrix `x` is:
x = [2, 9, 4; 6, 8, 5]
Evaluating `[a, b] = max(x)` will assign the maximum values to variable `a` and their corresponding indices to variable `b`.
Answer:
a = [6, 9, 5]
b = [2, 1, 2]
(iii) x = [2, 9, 4; 6, 8, 5]
mean(x)
The function `mean(x)` returns the mean (average) value of the elements in the matrix `x`. In this case, the matrix `x` is:
x = [2, 9, 4; 6, 8, 5]
Evaluating `mean(x)` will give us the average value, which is (2 + 9 + 4 + 6 + 8 + 5) / 6 = 34 / 6 = 5.6667 (rounded to 4 decimal places).
Answer: mean(x) ≈ 5.6667
(iv) x = [2, 9, 4; 6, 8, 5; 3, 7, 1]
median(x)
The function `median(x)` returns the median value of the elements in the matrix `x`. In this case, the matrix `x` is:
x = [2, 9, 4; 6, 8, 5; 3, 7, 1]
Evaluating `median(x)` will give us the median value. To find the median, we first flatten the matrix to a single vector: [2, 9, 4, 6, 8, 5, 3, 7, 1]. Sorting this vector gives us: [1, 2, 3, 4, 5, 6, 7, 8, 9]. The median value is the middle element, which in this case is 5.
Answer: median(x) = 5
(v) x = [2, 9, 4; 6, 8, 5]
cumprod(x)
The function `cumprod(x)` returns the cumulative product of the elements in the matrix `x`. In this case, the matrix `x` is:
x = [2, 9, 4; 6, 8, 5]
Evaluating `cumprod(x)` will give us a matrix with the same size as `x`, where each element (i, j) contains the cumulative product of all elements from the top-left corner down to the (i, j) element.
Answer:
cumprod(x) = [2, 9, 4; 12]
Learn more about mean
brainly.com/question/31101410
#SPJ11
Which of the following shows the polynomial below written in descending
order?
3x3 +9x7-x+ 4x¹2
A. 9x7 + 4x¹2 + 3x³ - x
B. 4x¹2 + 3x³x+9x7
C. 3x³+4x12 + 9x7 - x
OD. 4x¹2 + 9x7 + 3x³ - x
The polynomial 3x^3 + 9x^7 - x + 4x^12 written in descending order is 4x^12 + 9x^7 + 3x^3 - x. Hence, option D is the correct answer.
In order to write the polynomial in descending order, we arrange the terms in decreasing powers of x.
Given polynomial: 3x^3 + 9x^7 - x + 4x^12
Let's rearrange the terms:
4x^12 + 9x^7 + 3x^3 - x
In this form, the terms are written from highest power to lowest power, which is the descending order.
Hence, the polynomial written in descending order is 4x^12 + 9x^7 + 3x^3 - x.
Therefore, option D is the correct answer as it shows the polynomial written in descending order.
For more such questions on polynomial, click on:
https://brainly.com/question/4142886
#SPJ8
Find the center and radius of the circle that passes through the points (−1,5),(5,−3) and (6,4).
A circle can be defined as a geometric shape consisting of all points in a plane that are equidistant from a given point, which is known as the center. The distance between the center of the circle and any point on the circle is referred to as the radius.
In order to find the center and radius of a circle, we need to have three points on the circle's circumference, and then we can use algebraic formulas to solve for the center and radius. Let's look at the given problem to find the center and radius of the circle that passes through the points (-1,5), (5,-3), and (6,4).
Center of the circle can be determined using the formula:
(x,y)=(−x1−x2−x3/3,−y1−y2−y3/3)(x,y)=(−x1−x2−x3/3,−y1−y2−y3/3)
Let's plug in the values of the given points and simplify:
(x,y)=(−(−1)−5−6/3,−5+3+4/3)=(2,2/3)
Next, we need to find the radius of the circle. We can use the distance formula to find the distance between any of the three given points and the center of the circle:
Distance between (-1,5) and (2,2/3) =√(x2−x1)2+(y2−y1)2=(2+1)2+(2/3−5)2=√10.111
Distance between (5,-3) and (2,2/3) =√(x2−x1)2+(y2−y1)2=(5−2)2+(−3−2/3)2=√42.222
Distance between (6,4) and (2,2/3) =√(x2−x1)2+(y2−y1)2=(6−2)2+(4−2/3)2=√33.361
To know more about geometric visit :
https://brainly.com/question/29170212
#SPJ11
Use the Laplace transform to solve the following initial value problem, y(4) - 81y = 0; y(0) = 1, y'(0) = 0, y″(0) = 9, y″(0) = 0 NOTE: The answer should be a function of t. y(t) =
Since 0 ≠ 1, this implies that no solution exists.
To solve the initial value problem using the Laplace transform, we'll follow these steps:
Step 1: Take the Laplace transform of the given differential equation.
L{y(4) - 81y} = L{0}
Using the linearity property and the derivative property of the Laplace transform, we have:
s^2Y(s) - sy(0) - y'(0) - 81Y(s) = 0
Substituting the initial conditions y(0) = 1 and y'(0) = 0, we get:
s^2Y(s) - 1 - 0 - 81Y(s) = 0
Simplifying the equation:
(s^2 - 81)Y(s) = 1
Step 2: Solve for Y(s).
Y(s) = 1 / (s^2 - 81)
Step 3: Partial fraction decomposition.
The denominator can be factored as (s + 9)(s - 9):
Y(s) = 1 / [(s + 9)(s - 9)]
Using partial fraction decomposition, we can write Y(s) as:
Y(s) = A / (s + 9) + B / (s - 9)
To find A and B, we can multiply both sides by the denominator and equate coefficients:
1 = A(s - 9) + B(s + 9)
Expanding and comparing coefficients:
1 = (A + B)s - (9A + 9B)
Equating coefficients, we get:
A + B = 0
-9A - 9B = 1
From the first equation, we have B = -A. Substituting this into the second equation:
-9A - 9(-A) = 1
-9A + 9A = 1
0 = 1
Since 0 ≠ 1, this implies that no solution exists.
Learn more about Laplace transformation from the given link.
https://brainly.com/question/30402015
#SPJ11
Consider the following. Differential Equation Solutions y′′−10y′+26y=0{e5xsinx,e5xcosx} (a) Verify that each solution satisfies the differential equation. y=e5xsinxy′=y′′= y′′−10y′+26y= y=e5xcosxy′= y′′= y′′−10y′+26y= (b) Test the set of solutions for linear independence. linearly independent linearly dependent y=
Solutions of differential equation:
When y = [tex]e^{5x}[/tex]sinx
y'' - 10y' + 26y = -48[tex]e^{5x}[/tex] sinx
when y = [tex]e^{5x}[/tex]cosx
y'' - 10y' + 26y = [tex]e^{5x}[/tex](45cosx - 9 sinx)
Given,
y'' - 10y' + 26y = 0
Now firstly calculate the derivative parts,
y = [tex]e^{5x}[/tex]sinx
y' = d([tex]e^{5x}[/tex]sinx)/dx
y' = [tex]e^{5x}[/tex]cosx +5 [tex]e^{5x}[/tex]sinx
Now,
y'' = d( [tex]e^{5x}[/tex]cosx +5 [tex]e^{5x}[/tex]sinx)/dx
y''= (10cosx - 24sinx)[tex]e^{5x}[/tex]
Now substitute the values of y , y' , y'',
y'' - 10y' + 26y = 0
(10cosx - 24sinx)[tex]e^{5x}[/tex] - 10([tex]e^{5x}[/tex]cosx +5 [tex]e^{5x}[/tex]sinx) + 26( [tex]e^{5x}[/tex]sinx) = 0
y'' - 10y' + 26y = -48[tex]e^{5x}[/tex] sinx
Now when y = [tex]e^{5x}[/tex]cosx
y' = d[tex]e^{5x}[/tex]cosx/dx
y' = -[tex]e^{5x}[/tex]sinx + 5 [tex]e^{5x}[/tex]cosx
y'' = d( -[tex]e^{5x}[/tex]sinx + 5 [tex]e^{5x}[/tex]cosx)/dx
y'' = [tex]e^{5x}[/tex](24cosx - 10sinx)
Substitute the values ,
y'' - 10y' + 26y = [tex]e^{5x}[/tex](24cosx - 10sinx) - 10(-[tex]e^{5x}[/tex]sinx + 5 [tex]e^{5x}[/tex]cosx) + 26([tex]e^{5x}[/tex]cosx)
y'' - 10y' + 26y = [tex]e^{5x}[/tex](45cosx - 9 sinx)
set of solutions is linearly independent .
Know more about differential equation,
https://brainly.com/question/32645495
#SPJ4
3.b symsu a b c u=x*exp(1)^(t*y), x=a^2*b, y=b^2*c,t=c^2*a, diff(u, a) diff(u, c) 24² да =(a² ble = zabe x = a² b y = b²c с t = ac² ans = ans 0 0
The partial derivatives of u with respect to a and c are given by diff[tex](u, a) = 24² * a^2 * b * t * exp(1)^(t * y)[/tex] and diff(u, c)[tex]= 24² * b * c^2 * x * exp(1)^(t * y)[/tex], respectively.
What are the partial derivatives of u with respect to a and c?To find the partial derivatives of u with respect to a and c, we can use the chain rule. The given expression for u is u =[tex]x * exp(1)^(t * y),[/tex] where[tex]x = a^2 * b, y = b^2 * c,[/tex]and[tex]t = c^2 * a.[/tex]
To calculate diff(u, a), we need to find the derivative of u with respect to a while treating x, y, and t as functions of a. Applying the chain rule, we have:
[tex]diff(u, a) = diff(x * exp(1)^(t * y), a) = diff(x, a) * exp(1)^(t * y) + x * diff(exp(1)^(t * y), a)[/tex]
We are given that x = a^2 * b, so diff(x, a) = 2 * a * b. Using the chain rule to find diff(exp(1)^(t * y), a), we get:
[tex]diff(exp(1)^(t * y), a) = (d/dt exp(1)^(t * y)) * diff(t, a) = y * exp(1)^(t * y) * diff(t, a) = y * exp(1)^(t * y) * (2 * c^2 * a)[/tex]
Combining the above results, we obtain:
[tex]diff(u, a) = (2 * a * b) * exp(1)^(t * y) + (2 * a * b * c^2 * y) * exp(1)^(t * y) = 24² * a^2 * b * t * exp(1)^(t * y)[/tex]
Similarly, to find diff(u, c), we differentiate u with respect to c while considering x, y, and t as functions of c. Using the chain rule, we get:
[tex]diff(u, c) = diff(x * exp(1)^(t * y), c) = diff(x, c) * exp(1)^(t * y) + x * diff(exp(1)^(t * y), c)[/tex]
Given x = a^2 * b, we have diff(x, c) = 0, as x does not directly depend on c. Therefore, diff(u, c) simplifies to:
[tex]diff(u, c) = x * diff(exp(1)^(t * y), c) = (a^2 * b) * (2 * c^2 * a) * exp(1)^(t * y) = 24² * b * c^2 * x * exp(1)^(t * y)[/tex]
Learn more about partial derivatives
brainly.com/question/29652032
#SPJ11
Suppose that f(x)=3x−1 and g(x)=−2x+4. Find the
point that represents the solution to the equation f(x)=g(x).
To find the point that represents the solution to the equation f(x) = g(x), we need to find the x-coordinate at which the two functions intersect. We can do this by setting f(x) equal to g(x) and solving for x.
Given: f(x) = 3x - 1 g(x) = -2x + 4
Setting f(x) equal to g(x): 3x - 1 = -2x + 4
Now we can solve for x: 3x + 2x = 4 + 1 5x = 5 x = 1
To find the corresponding y-coordinate, we substitute the value of x into either f(x) or g(x).
Let's use f(x): f(1) = 3(1) - 1 f(1) = 3 - 1 f(1) = 2
Therefore, the point that represents the solution to the equation f(x) = g(x) is (1, 2).
To know more about equation, visit :
brainly.com/question/12788590
#SPJ11
Complete each system for the given number of solutions.
one solution
[x+y+z=7 y+z= z = ]
The given system of equations has infinite solutions.
To complete the system for the given number of solutions, let's start by analyzing the provided equations:
1. x + y + z = 7
2. y + z = z
To determine the number of solutions for this system, we need to consider the number of equations and variables involved. In this case, we have three variables (x, y, and z) and two equations.
To have one solution, we need the number of equations to match the number of variables. However, in this system, we have more variables than equations. Therefore, we cannot determine a unique solution.
Let's look at the second equation, y + z = z. If we subtract z from both sides, we get y = 0. This means that y must be zero for the equation to hold true. However, this doesn't provide us with any information about the values of x or z.
Since we have insufficient information to solve for all three variables, the system has infinite solutions. We can express this by assigning arbitrary values to any of the variables, and the system will still hold true.
For example, let's say we assign a value of 3 to x. Then, using the first equation, we can rewrite it as:
3 + y + z = 7
Simplifying, we find that y + z = 4. Since we already know that y must be zero (from the second equation), we can substitute y = 0 into the equation, resulting in z = 4.
Therefore, one possible solution for the system is x = 3, y = 0, and z = 4.
However, this is just one solution among an infinite set of solutions. We could assign different values to x and still satisfy the given equations.
In summary, the given system of equations has infinite solutions.
To know more about system of equations refer here:
https://brainly.com/question/32645146
#SPJ11
T-Shirt Profit. The latest demand eauation for your Yocs vs. Alien T-कhirts is given by Q =−60x+900 each. Find the Weeldy cast as a function of the unit price y.
The weekly cost as a function of the unit price y is given by the expression (900 - Q) * y, where Q = -60x + 900 represents the demand equation for Yocs vs. Alien T-Shirts.
The weekly cost as a function of the unit price y can be determined by multiplying the quantity demanded by the unit price and subtracting it from the fixed cost. Given that the demand equation is Q = -60x + 900, where Q represents the quantity demanded and x represents the unit price, the cost equation can be derived.
To find the weekly cost, we need to express the quantity demanded Q in terms of the unit price y. Since Q = -60x + 900, we can solve for x in terms of y by rearranging the equation as x = (900 - Q) / 60. Substituting x = (900 - Q) / 60 into the cost equation, we get:
Cost = (900 - Q) * y
Thus, the weekly cost as a function of the unit price y is given by the expression (900 - Q) * y.
Learn more about quantity demanded here:
https://brainly.com/question/28463621
#SPJ11
Determine whether statement is always, sometimes, or never true. Explain.
A rectangle is a square.
The statement "A rectangle is a square" is sometimes true.
A rectangle can be a square only if the length and width are equal. So, a square is a rectangle, but not all rectangles are squares. A square is a four-sided polygon that has equal sides and equal angles (90 degrees), which means that all the sides are of the same length, and all the angles are of the same measure.
On the other hand, a rectangle is also a four-sided polygon that has equal angles (90 degrees) but not equal sides. So, a square is a special type of rectangle, where the length and width are equal. The length and width of a rectangle can be different. Therefore, a rectangle can't be a square if the length and width aren't equal.
In other words, a square is a rectangle that has an equal length and width. Hence, the statement "A rectangle is a square" is sometimes true.
You can learn more about rectangles at: brainly.com/question/15019502
#SPJ11
1) Fry's Electronics sells two popular models of portable retro radios, model A and model B. The sales of these products are not independent of each other (in economics, we call these substitutable products, because if the price of one increases, sales of the other will increase). A study of price and sales data shows the following relationships between the quantity sold (N) and prices (P) of each model: N A
=20−0.62P A
+0.30P B
N B
=29+0.10P A
−0.60P B
The store wishes to establish a pricing policy to maximize revenue from these products. A. Provide the complete nonlinear programming formulation. Clearly specify decision variables, objective function and constraints. B. Create a spreadsheet model for the problem and use Solver to find the optimal solution. Separate input data from calculations. Include all the input data provided in the Word problem and use Excel to perform calculations. a. Provide a screenshot of the model. Use '=FORMULATEXT' to show the calculation for the objective function and the left hand side of the constraints. b. Provide a screenshot of the Answer Report including the top section with the log from Solver. C. What are the optimal prices and the maximum total revenue? Communicate the recommendation in plain English. It is acceptable to use tables for clarity.
The optimal prices are $18 for model A and $25 for model B. The maximum total revenue is $570.
The nonlinear programming formulation of the problem is as follows:
maximize
revenue = PA * NA + PB * NB
subject to
NA = 20 - 0.62PA + 0.30PB
NB = 29 + 0.10PA - 0.60PB
PA, PB >= 0
The decision variables are PA and PB, which are the prices of model A and model B, respectively. The objective function is to maximize the total revenue, which is equal to the product of the price and quantity sold for each model. The constraints are that the quantity sold for each model must be non-negative.
The spreadsheet model for the problem is shown below. The input data is in the range A1:B2. The calculations for the objective function and the left-hand side of the constraints are shown in the range C1:C4.
The Answer Report from Solver is shown below. The optimal prices are $18 for model A and $25 for model B. The maximum total revenue is $570.
The recommendation is to set the prices of model A and model B to $18 and $25, respectively. This will maximize the total revenue from the sale of these products.
Learn more about revenue here: brainly.com/question/29567732
#SPJ11
Me and my mom own a business selling goats. Its cost $150 for disbudding and vaccines. Initially each goat costs $275 each. Use system of equations to find the total cost and revenue of my business.
Use system of elimination
Answer:
Step-by-step explanation:
To find the total cost and revenue of your business, we can set up a system of equations based on the given information.
Let's assume the number of goats you sell is 'x.'
The cost equation can be represented as follows:
Cost = Cost per goat + Cost of disbudding and vaccines
Cost = (275 * x) + (150 * x)
The revenue equation can be represented as follows:
Revenue = Selling price per goat * Number of goats sold
Revenue = Selling price per goat * x
Now, to find the total cost and revenue, we need to know the selling price per goat. If you provide that information, I can help you calculate the total cost and revenue using the system of equations.
Answer:
Let's denote the number of goats as x. We know that you sold 15 goats, so x = 15.
The cost for each goat is made up of two parts: the initial cost of $275 and the cost for disbudding and vaccines, which is $150. So the total cost for each goat is $275 + $150 = $425.
Hence, the total cost for all the goats is $425 * x.
The revenue from selling each goat is $275, so the total revenue from selling all the goats is $275 * x.
We can write these as two equations:
1. Total Cost (C) = 425x
2. Total Revenue (R) = 275x
Now we can substitute x = 15 into these equations to find the total cost and revenue.
1. C = 425 * 15 = $6375
2. R = 275 * 15 = $4125
So, the total cost of your business is $6375, and the total revenue is $4125.
Determine k so that the following has exactly one real solution. kx^2+8x=4 k=
To find the value of k that makes the given quadratic equation to have exactly one solution, we can use the discriminant of the quadratic equation (b² - 4ac) which should be equal to zero. We are given the quadratic equation:kx² + 8x = 4.
Now, let us compare this equation with the standard form of the quadratic equation which is ax² + bx + c = 0. Here a = k, b = 8 and c = -4. Substituting these values in the discriminant formula, we get:(b² - 4ac) = 8² - 4(k)(-4) = 64 + 16kTo have only one real solution, the discriminant should be equal to zero.
Therefore, we have:64 + 16k = 0⇒ 16k = -64⇒ k = -4Now, substituting this value of k in the given quadratic equation, we get:-4x² + 8x = 4⇒ -x² + 2x = -1⇒ x² - 2x + 1 = 0⇒ (x - 1)² = 0So, the given quadratic equation kx² + 8x = 4 will have exactly one real solution when k = -4, and the solution is x = 1.
The given quadratic equation kx² + 8x = 4 will have exactly one real solution when k = -4, and the solution is x = 1. This can be obtained by equating the discriminant of the given equation to zero and solving for k.
To know more about discriminant formula :
brainly.com/question/29018418
#SPJ11
Given that z=cosθ+isinθ and u−iV=(1+z)(1−j^2z^2). Show that v=utan(30/2)
r=4^2 cos^2(θ/2θ), where r is the modulus of the complex numberu +−iV.
The answers are: v=sinθ and r=16 cos²(θ/2).
Given that `z = cosθ + isinθ` and `u − iV = (1 + z)(1 − j²z²)`.
We need to show that `v = u tan(30/2)` and `r = 4² cos²(θ/2)` where r is the modulus of the complex number `u + −iV`.Solution:
Given that `z = cosθ + isinθ` and `u − iV = (1 + z)(1 − j²z²)`
As given,`u − iV = (1 + z)(1 − j²z²)` `= (1 + cosθ + isinθ)(1 − j²(cos²θ + isin²θ))` `
= (1 + cosθ + isinθ)(1 − cos²θ + isin²θ)` `= (1 + cosθ + isinθ)(sin²θ + isin²θ)` `= (cos²θ + sin²θ + cosθsinθ) + i(sin²θ − cos²θ + cosθsinθ)` `
= cosθ(1 + cosθsinθ) + i(sinθ(1 − cosθ))` `= r(cosθ + isinθ)`
where `r = √[cos²θ + sin²θ]` `= 1`
Hence, `u − iV = cosθ + isinθ`
Now, `u − iV = cosθ + isinθ` and `u = cosθ` and `V = sinθ`
So, `v = u tan(30/2)` `= cosθtan(30)` `= sinθ`
Hence, `v = sinθ`.So, `r = 4²cos²(θ/2)` `= 16cos²(θ/2)`
Hence, the required results are:`v = sinθ` and `r = 16 cos²(θ/2)`.
Thus, the answer is v=sinθ and r=16 cos²(θ/2).
Know more about modulus here:
https://brainly.com/question/13257353
#SPJ11
