Math crossword puzzle

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Across
  1. 3. a pair of numbers given a location on a grid.
  2. 6. first, outers, Inners, lasts.
  3. 8. polynomial with three terms.
  4. 10. a mathematical sentence built from expressions using one or more equal signs.
  5. 11. least common multiple (the short cut)
  6. 12. plural for axis
  7. 14. the mathematics of working with variable's.
  8. 15. polynomial with two terms.
  9. 17. we're a negative turns to a positive with 2 bars.
  10. 19. Y variables in a function
Down
  1. 1. the plane formed by a horizontal axis and a vertical axis.
  2. 2. number that occurs most often.
  3. 4. the sum of difference of terms which have variable's raised to positive integer powers.
  4. 5. polynomial with one term.
  5. 7. a number that has to be multiplied by itself three times.
  6. 9. the list of independent variables.
  7. 13. the middle number(s) of the number list when in order from least to greatest.
  8. 16. coefficient: the coefficient of a polynomial's leading term.
  9. 18. another word for average.