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:
Transcendental Functions and Introduction To The Exponential Function
The Exponential Function, A Classic Example
Introduction To And Properties of Logarithms
Solving Exponential Functions; The Change-of-Base Formula
Solving Logarithmic Functions and Inverse Functions