Math 1 · Unit 9 · Lesson 1 · part 1 of 5
The Words We Use
The vocabulary for this lesson, in one place.
Words we use
| Word | Plain English | What you do |
|---|---|---|
| Sequence | A list of numbers in a set order. | Read it left to right; every position has one number. |
| Term | One number in the list. | Name it by where it sits. |
| Term number (position, index) | Where a term sits in the list: 1st, 2nd, 3rd. | It is the input. Only whole numbers. |
| an, said a sub n | The nth term: the term in position n. a1 is the first term. | Same as f(n) in function notation. |
| Domain and range | The inputs (term numbers) and the outputs (terms). | The domain is whole numbers only. |
| Discrete | Separate dots, because only whole-number inputs exist. | Plot dots. Do not connect them. |
| Arithmetic, geometric | A list that adds the same amount; a list that multiplies by the same number. | Subtract to check the first; divide to check the second. |