Dilshan's cool crossword puzzle

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Across
  1. 5. x, y, etc.
  2. 6. Not allowed to use a writing utensil in math class.
  3. 8. On a graph it kind of looks like the letter “U” either upright or upside-down
  4. 10. A rate of change that either decreases or increases and is not constant
  5. 11. Johnny wants to become the best basketball player in the world, but his parents want him to be a tennis player, what could his parents' opinions in his life be called?
  6. 13. Used to make straight edges if no ruler is available, also it is used to hold paper
  7. 14. Best Math teacher in the whole universe
  8. 17. A visual representation of equations or data
  9. 18. “to go” in Spanish, plus the word rational
  10. 19. The amount of papers that I have about math
  11. 20. Tool not allowed to be used on section 1 of MCAP testing
  12. 21. 8<x<20
Down
  1. 1. A ball rolls very slow when this number is low, but fast on a hill when this number is high.
  2. 2. What a number is called when it repeats or terminates
  3. 3. π
  4. 4. A constant rate of change
  5. 7. The best way to solve systems of equations
  6. 9. The side lengths of a square with an area of -9 (2 words)
  7. 12. The number that makes math easy in nearly all cases (:
  8. 15. Shapes in math
  9. 16. Dunloggin’s favorite mythical creature