# Why is the Derivative of the Area of a Circle Equal to the Circumference?

This video gives an informal explanation as to why the derivative of the area of a circle is equal to the circumference.

# Why is the Derivative of the Volume of a Sphere Equal to the Surface Area?

This video gives an informal explanation as to why the derivative of the volume of a sphere is equal to the surface area.

# Discover the Rule for Solving Inequality (Inequality Web)

This video helps to understand the rule of reversing an inequality symbol with multiplying or dividing by a negative.

# Ex: Solving a One Step Linear Inequality by Multiplying

This video provides two examples of solving one step linear inequalities in one variable by multiplying with the variable on the left.  The solutions are also written using interval notation.

# Ex: Solve a Multiple Step Linear Inequality (Variable Both Sides)

```This video provides an example of solving multiple step linear inequalities in one variable with variables on both sides.  The solution is also written using interval notation.
```

# Ex: Solve a Two Step Linear Inequality (Variable Right)

```This video provides two examples of solving two step linear inequalities in one variable with the variable on the right.  The solutions are also written using interval notation.
```

# Ex: Solve a Two Step Linear Inequality (Variable Left)

This video provides two examples of solving two step linear inequalities in one variable with the variable on the left.  The solutions are also written using interval notation.