Math lol

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Across
  1. 5. the set of all possible input values of a function
  2. 7. a set of points consisting of two rays
  3. 11. terms that can be described using known words
  4. 13. angles of a polygon
  5. 14. points that lie on the same line
  6. 17. a literal equation that shows how one variable is related to one or no other variables
  7. 19. line segments that have the same length
  8. 20. a statement that two expressions are equal
Down
  1. 1. two lines in the same plane that never intersect
  2. 2. points that represent the ends of a a line segment or ray
  3. 3. the "if" part of a conditional statement
  4. 4. the starting point of a vector
  5. 6. each entry in a two-way table
  6. 8. a real number that corresponds to a point on a line
  7. 9. the value or values that occur most often in a data set
  8. 10. a relation that pairs each input with exactly one output
  9. 12. the ratio between each pair of consecutive terms
  10. 15. a relationship between data sets
  11. 16. two adjacent angles whose non common sides are opposite rays
  12. 18. a rule that is accepted without proof