Tristan's math crossword. (There are no spaces)

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Across
  1. 3. The starting point of a graph (Most commonly zero)
  2. 5. The property in which the parenthesis are moved but the numbers and awnser remain the same
  3. 6. Containes the X and Y axises
  4. 7. The right coordinate in an ordered pair
  5. 11. The axis that goes vertically on a graph
  6. 13. The property in which when a number is multiplied by 1 it remaines the same and when a number is added with zero it remaines the same
  7. 15. The distance a number is away from zero
  8. 16. The number category that only has positive numbers
  9. 17. To form an idea of the amount, number, or value of
  10. 18. When a thing is totally different from another, it is ______
Down
  1. 1. The property in which the numbers are moved around but the numbers and the awnser remain the same
  2. 2. The left coordinate in an ordered pair
  3. 4. The number category that only includes negative and positive numbers
  4. 8. The property in which the numbers are added or multiplied by themselves then added together in the end
  5. 9. The number category that includes decimals/fractions, integers and whole numbers
  6. 10. The axis that goes horizontally on a graph
  7. 12. The property in which you add/multiply a number by the opposite is always ends up as zero
  8. 14. A sector of a graph