Translate the following English statement into a differential equation:
Jenna's savings account grows at a rate of $300 per year.
The two quantities described are savings (in $) and time (in years). Let S stand for savings and t for time in years. Then the "rate" at which Jenna's savings account grows is the same thing as the "derivative" of savings with respect to time, or
The statement says the rate of change of savings is $300 dollars per year. As a differential equation,