algebra crossword puzzle

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Across
  1. 6. any value below zero
  2. 9. a straight or curved continuous extent of length without breadth
  3. 11. an algebraic expression
  4. 14. the quality or state of being correct or precise inverse produced from or related to something else by a process of inversion
  5. 15. number that divides another number
  6. 17. possible inputs for the function
  7. 18. the number multiplied by itself
  8. 19. Where a function equals zero
Down
  1. 1. an expression that defines a relationship between one variable
  2. 2. number with no decimal or fractional part
  3. 3. consisting of several terms
  4. 4. a number, quantity, or expression
  5. 5. a numerical or constant quantity placed before and multiplying
  6. 7. a line that approaches a curve
  7. 8. the way in which something is shared out among a group or spread over an area
  8. 10. statement that the values of two mathematical expressions are equal
  9. 12. a number, quantity, or expression not expressible as a ratio of two integers
  10. 13. difference between the highest and lowest values
  11. 16. measure of its steepness