Math words and animals

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Across
  1. 3. math with letters
  2. 5. where a line goes through an axis
  3. 8. rodent of the trees
  4. 9. crocodile's cousin
  5. 11. The number in front of the variable
  6. 12. belongs to the dog family (wild)
  7. 14. This type of growth multiplies fast!
  8. 16. (0,0) on a coordinate plane
  9. 17. A line that cuts a parabola in half
  10. 18. The bottom of an upward facing parabola
Down
  1. 1. A large marsupial
  2. 2. This type of function is a parabola
  3. 4. means 2 things are related
  4. 6. North Carolina's state bird
  5. 7. A number that can fit evenly into another
  6. 10. math involving shapes
  7. 13. The Top of a downward facing parabola
  8. 14. Dumbo was this
  9. 15. Ben Franklin wanted this bird to be our symbol