## 18.3 Outline

- Average rate of change
- Instantaneous rate of change
- Derivative
- derivative of
*f*at*x* - differentiable function
- derivative of
*e*^{x}

- derivative of
- Tangent line
- tangent-line

formula - equation of tangent line at a point (
*h, k*).

- tangent-line
- Velocity