10.3 Outline
- Growth/decay formula
- Population growth
- Radioactive decay
- Logarithmic scales
- Richter number
- Richter scale
- decibel
- decibel formula
10.3 Essential Ideas
Exponential growth or decay can be described by the equation
A=Aoert
where r is the annual growth/decay rate, t is the time (in years), Ao is the amount present initially (present value) and A is the future value. If r is positive, this formula models growth and if r is negative, the formula models decay.