Here are five lectures that I gave on transcentental functions (the exponential and logarithmic functions). They are at the pre-calculus level but might also be helpful as a refresher for calculus. The topics of the lectures are:

1. Transcendental Functions and Introduction To The Exponential Function
2. The Exponential Function, A Classic Example
3. Introduction To And Properties of Logarithms
4. Solving Exponential Functions; The Change-of-Base Formula
5. Solving Logarithmic Functions and Inverse Functions