Math Crassword Puzzle

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Across
  1. 4. region defined by the two axes
  2. 6. determines the number of possible arrangements the number of ways that a number of things can be ordered
  3. 7. number that is being multiplied by the variable
  4. 9. determines the number of possible arrangements
  5. 12. amount that is subtracted from the regular price
  6. 13. fee paid for borrowing money or other assets
  7. 16. a shape with four sides
  8. 17. two ratios are set equal to each other
  9. 18. is less than zero
  10. 19. closed plane figure bounded by straight lines
Down
  1. 1. is greater than zero
  2. 2. a line that passes through two lines
  3. 3. when multiplied by itself, gives the original number
  4. 5. the end result of an exquation
  5. 8. parallelogram with four equal sides and sometimes one with no right angles.
  6. 10. all equal sides
  7. 11. cutting a line exactly in half
  8. 14. the chance of getting a number notation A system of figures
  9. 15. quadrilateral with one pair of opposite sides parallel Parallel lines that are always the same distance apart