### Introduction

This Section provides examples and tasks employing exponential functions and logarithmic functions, such as growth and decay models which are important throughout science and engineering.

#### Prerequisites

- be familiar with the laws of logarithms
- have knowledge of logarithms to base 10
- be able to solve equations involving logarithms and exponentials

#### Learning Outcomes

- develop exponential growth and decay models

#### Contents

1 Exponential increase2 Linearisation of exponential functions

3 Exponential decrease

4 Engineering Example 2

4.1 Exponential decay of sound intensity

5 Growth and decay to a limit

6 Engineering Example 3

6.1 Inverse square law decay of electromagnetic power

7 Logarithmic relationships