# Points, Vectors, and Functions

### Best of the Web

### Websites

**Math is Fun: Increasing and Decreasing**

Functions can be complicated sometimes. If you're still having trouble figuring out which way is up, this link will help you. It should help you figure out which way it down, too.

**Math is Fun: Even and Odd Functions**

This is a little extra help on how to check if a function is even or odd. You won't be able to tell how many legs a function has. That's in the next chapter.

**Math is Fun: Polar and Rectangular Coordinates**

No, we aren't talking about bears and squares. These two different coordinate systems are two different ways to describe the same thing, and they are explained briefly in this link.

### Videos

**Meat-A-Morphosis: An Introduction to Functions**

Someone once said that a way to a man's heart is through his stomach. Here's a fun video about food machines, function machines, and steak fries.

**Khan Academy: Parametric Equations**

See Dick. See Dick drive. See Dick drive over a cliff. Parameterize Dick's fall and untimely demise.

**Khan Academy: Rectangular and Polar Coordinates Polar to Cartesian**

Need some more help figuring out how to fit a square peg into a round hole? What if you need to fit a round peg into a square hole? These videos explain better how to transform from rectangular to polar and polar to rectangular coordinates.

### Games and Tools

**The Function Machine**

Still having trouble with functions? Figure out what function is inside the box. It's sort of like Christmas, but you won't be getting a new pair of jeans from the function machine.

**Vector Addition and Subtraction**

They used to tell jokes and juggle. Now unemployed and in need of juggling equipment, this jester needs your help clearing a path to his ball by adding the vectors tip to tail.

**Vector Calculators**

If you are still having some trouble, or if you want a calculator to check your answers, here's a tool to help you do basic vector operations. With this, you can rule the world.

**The Engineering Toolbox: Polar Coordinates Converter**

Here's a link on how to convert between polar and rectangular coordinates. It has a calculator, to boot!

**A Parametric Polar Plotter**

Plot your own polar functions, and waste hours online making neat polar art. This link will also help you learn how to choose bounds on θ to stop your polar function and your head spinning.