## 6.3 Outline

- Evaluate – this is the third of four main processes in algebra
- definition
- with exponents
- with mixed operations

- An application from genetics
- Spreadsheets
- definition
- cell
- replicate

## 6.3 Essential Ideas

Mathematical substitution is used with the evaluation of expressions. For example if *x = y* and *y* = 3, then *x* = 3.

We also use spreadsheet evaluation in this section.

An interesting application from the biological sciences is also consider in this section.