Mathematics High School

Find an autonomous differential equation with all of the following properties:
equilibrium solutions at y=0 and y=3,
y' > 0 for 0 y' < 0 for -inf < y < 0 and 3 < y < inf
dy/dx =

Answers

Answer 1
To find an autonomous differential equation with the given properties, we can start by considering the equilibrium solutions. Since we want equilibrium solutions at y=0 and y=3, we can set up a quadratic equation in the form:

y(y - 3) = 0

Expanding the equation:

y^2 - 3y = 0

Now, let's consider the signs of y' in different intervals:

1. For 0 < y < 3, we want y' to be positive. We can introduce a factor of y on the right-hand side of the equation to ensure this:

y' = ky(y - 3)

2. For y < 0 and y > 3, we want y' to be negative. We can introduce a negative factor of y on the right-hand side to achieve this:

y' = ky(y - 3)(y - 0)

Where k is a constant that determines the rate of change.

Combining the conditions, we can write the autonomous differential equation with the given properties as:

y' = ky(y - 3)(y - 0)

This equation has equilibrium solutions at y=0 and y=3, and satisfies the conditions y' > 0 for 0 < y < 3, and y' < 0 for y < 0 and y > 3.
Answer 2

all the three terms on the right-hand side are positive and hence dy/dx is negative. Thus, this satisfies all the properties given. Therefore, the required autonomous differential equation is:dy/dx = a (y - 3) (y) (y - b).

We can obtain the autonomous differential equation having all of the given properties as shown below:First of all, let's determine the equilibrium solutions:dy/dx = 0 at y = 0 and y = 3y' > 0 for 0 < y < 3For -∞ < y < 0 and 3 < y < ∞, dy/dx < 0This means y = 0 and y = 3 are stable equilibrium solutions. Let's take two constants a and b.a > 0, b > 0 (these are constants)An autonomous differential equation should have the following form:dy/dx = f(y)To get the desired properties, we can write the differential equation as shown below:dy/dx = a (y - 3) (y) (y - b)If y < 0, y - 3 < 0, y - b < 0, and y > b. Therefore, all the three terms on the right-hand side are negative and hence dy/dx is positive.If 0 < y < 3, y - 3 < 0, y - b < 0, and y > b. Therefore, all the three terms on the right-hand side are negative and hence dy/dx is positive.If y > 3, y - 3 > 0, y - b > 0, and y > b. Therefore, all the three terms on the right-hand side are positive and hence dy/dx is negative. Thus, this satisfies all the properties given. Therefore, the required autonomous differential equation is:dy/dx = a (y - 3) (y) (y - b).

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Related Questions

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c. estimated regression equation
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Answers

The coefficient of determination is often used to evaluate the usefulness of regression models.

In simple linear regression, r2 is the coefficient of determination. In statistics, a measure of the proportion of the variance in one variable that can be explained by another variable is referred to as the coefficient of determination (R2 or r2).

The coefficient of determination, often known as the squared correlation coefficient, is a numerical value that indicates how well one variable can be predicted from another using a linear equation (regression).The coefficient of determination is always between 0 and 1, with a value of 1 indicating that 100% of the variability in one variable is due to the linear relationship between the two variables in question.

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The shape of a histogram of the distribution of scores on a midterm exam in a graduate statistics course is likely to be bell-shaped, symmetrical, and normally distributed. The bell curve, or the normal distribution, is a common pattern that emerges in many natural and social phenomena, including test scores.

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