Brielle and Mia's beautiful puzzle

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Across
  1. 1. a little number over x
  2. 3. math you take freshman and junior years
  3. 5. number in front of the variable
  4. 7. type of whale
  5. 10. Highest points on a graph
  6. 13. Values getting greater from left to right
  7. 15. 4+ terms
  8. 16. 1 term
  9. 17. Values getting smaller from left to right
  10. 18. 3 degree
  11. 19. 3 terms
Down
  1. 2. Highest and lowest points on a graph
  2. 4. 1 degree
  3. 5. black and white animal moo
  4. 6. i put in place for a negative number
  5. 8. simplify expression in ()
  6. 9. Lowest point on a graph
  7. 11. No x value
  8. 12. 2 degree
  9. 14. 2 terms