Number System

2. The number under the (radical) symbol
4. three rational expression
8. numbers cannot be expressed as the ratio of two integers
9. 2 rational expression
12. it includes both positive number , negative number and zero in a number line
13. it is used to find the longest side in a triangle

1. to make the denominator from irrational to rational
3. the number including 0 and continues with 1 to infinite
5. numbers from 1 to infinite
6. formed by changing the sign between two terms
7. used to mean a number that uses a decimal point followed by digits that show a value smaller than one
10. one rational expression
11. placed before an expression to denote that the square root is to be extracted or that the root marked by an index