This is a very brief review of differential equations. I hope you have some textbooks to fill in all the details.

Suppose we have a variable **x** -- it could represent
time, or distance, or any other property.
We discover that there's a connection between this
variable and another quantity: the other quantity
depends on **x**.
We can call it a **function of x: f(x)**.

There are many ways that we can connect two quantities mathematically. Let's start with simple ones and work our way up to more complex ones.

Can you figure out a function **f(x)** which will
satisfy each equation?

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