Math crossword puzzle

2. plural for axis
4. a number that has to be multiplied by itself three times.
5. the list of independent variables.
8. polynomial with three terms.
11. a pair of numbers given a location on a grid.
14. we're a negative turns to a positive with 2 bars.
15. polynomial with two terms.
17. polynomial with one term.
18. a mathematical sentence built from expressions using one or more equal signs.

1. another word for average.
2. the mathematics of working with variable's.
3. the plane formed by a horizontal axis and a vertical axis.
6. least common multiple (the short cut)
7. coefficient: the coefficient of a polynomial's leading term.
9. Y variables in a function
10. first, outers, Inners, lasts.
12. the sum of difference of terms which have variable's raised to positive integer powers.
13. the middle number(s) of the number list when in order from least to greatest.
16. number that occurs most often.