Reid&Alyssa's Hardest Puzzle Ever

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Across
  1. 4. function with 2 terms
  2. 5. Minty
  3. 7. function with 4+ terms
  4. 10. function with degree of 3
  5. 13. Highest and Lowest
  6. 14. Going down
  7. 16. Very Bottom
  8. 18. Going up
  9. 20. No exponent
Down
  1. 1. function with 3 terms
  2. 2. Peak
  3. 3. A line
  4. 6. Little Number
  5. 8. function with degree with 2
  6. 9. Minus
  7. 11. not real number
  8. 12. Highest exponent in a polynomial
  9. 15. Ink
  10. 17. function with 1 term
  11. 19. Plus