crossword puzzle

2. the point where co-ordinates are (0,0) ?
3. number that includes rational as well as irrational numbers ?
4. numbers which include zero are ?
8. the x-axis is also called as ?
9. polynomial that has 2 zeroes only is ?
12. the method of replacing a variable with a constant in and algebraic expression is called?
13. an algebraic expression that consists of variables and coefficients is ?
15. set of numbers that can't be represented as

1. a factor which can be change in an equation
5. the side which is the sum of other 2 sides of a triangle.
6. the number in p/q form with denominator not equal to zero is ?
7. the equation with 3 zeroes is called
10. the y-axis is also known as ?
11. set of integers that can be represented in ratios and the denominator not equal to zero in p/q form?
14. numbers that don't include zero are called ?
16. the number that can be represented as positive or negative is ?