Chapter 1 & 2

2. each item in a matrix
8. the opposite of a number
9. a mathematical phrase that can include numbers, variables, and operation symbols
11. a symbol, usually a letter, that represents one or more numbers
13. cannot be expressed in the form a/b, where a and b are integers
16. has two parts, a base and an exponent
18. a rectangular arrangement of numbers in rows and columns
19. two numbers that are the same distance from 0 on a number line but lie in opposite directions are opposites
20. of a number is its distance from 0 on a number line

1. counting numbers excluding 0
3. of a nonzero rational number a/b is b/a
4. any example that proves a statement false
5. a mathematical sentence that compares the value of two expressions using an inequality symbol
6. an equation that contains one or more variables
7. rational numbers and irrational numbers form
10. whole numbers and their opposites
12. any number that you can write in the form a/b
14. synonym for multiplicative inverse
15. counting numbers including 0
17. a mathematical sentence that uses an equal sign