Differential Equations
Which of the following differential equations corresponds to the slope field where the slopes are always equal to the x-coordinate at any given point?
Which of the following scenarios is best modeled using a differential equation?
The constant speed of a car on a highway.
The population growth of a bacteria colony where the growth rate is proportional to the current population.
The fixed interest rate on a savings account.
The trajectory of a ball thrown in a vacuum.
A slope field is shown with horizontal line segments along the line y = x. Which of the following differential equations could the slope field represent?
Using Euler's method with a step size of 0.1, approximate y(1.1) for the differential equation with the initial condition y(1) = 2.
2.0
2.1
2.105
2.2
Given the differential equation with initial condition y(0) = 1, you want to approximate y(1) using Euler's method. To ensure your approximation is within 0.1 of the actual value, which strategy is most appropriate?
Use a fixed step size of h = 0.5.
Use a step size of h = 1.0.
Start with a step size of h = 0.2 and halve the step size iteratively, comparing successive approximations until they are within a small tolerance (e.g., 0.01) of each other.
There is no way to ensure the approximation is within 0.1 of the actual value.
What is the primary use of differential equations in mathematical modeling, as described in the provided text?
To describe physical situations using traditional language.
To relate a quantity's rate of change to itself.
To confirm only predictable actions.
To avoid logical derivations.
A scientist observes that the rate of decay of a radioactive substance is proportional to the amount of the substance remaining. Which type of equation would be most suitable to model this phenomenon?
A linear equation.
A quadratic equation.
A differential equation.
An integral equation.

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For the differential equation , in which region of the xy-plane are the slopes in the slope field positive?
Only in the first quadrant.
Where .
Where .
Only when and
Consider the differential equation with initial condition y(0) = 1. Using Euler's method with a step size of h = 0.2, approximate y(0.4).
1.00
1.20
1.44
1.96