Math crossword puzzle

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Across
  1. 2. total number of anything in a certain area
  2. 4. Ballot ballot where the voter indicates only their 1st place choice.
  3. 5. the number of votes cast for a candidate who receives more than any other but does not receive an absolute majority.
  4. 10. manipulate the boundaries of an electoral constituency so as to favor one party or class
  5. 14. to divide/ allocate
  6. 15. A path that begins and ends at the same vertex
  7. 16. an electoral system whereby voters rank candidates in order of preference.
  8. 19. The minimum number of votes
  9. 20. A path that contains all the arcs of a directed graph exactly once.
Down
  1. 1. rule the one with the majority (more than half of the votes)
  2. 3. the number your diving by
  3. 6. a single-winner election method in which voters rank options or candidates in order of preference.
  4. 7. a surface or solid formed by rotating a closed curve
  5. 8. ballot a ballot in which ties are not allowed
  6. 9. piece of paper you vote on
  7. 11. A segment which joins two consecutive vertices
  8. 12. specialized series of steps
  9. 13. a position in a scale of achievement or status; a classification.
  10. 17. A chain of communication that send and receive messages of various types.
  11. 18. endpoint of an arc