Final crossword puzzle

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Across
  1. 1. to add up
  2. 3. a symbol and placeholder
  3. 4. a number that describes both the direction and the steepness of the line
  4. 7. a mathematical expression
  5. 10. a relationship or expression involving one or more variables
  6. 12. a pattern or fiqure used in a problem
  7. 13. the amount or number of a material
  8. 14. the set of values that a given function
  9. 16. a graphical representation that organizes a group of data points
  10. 18. branch of mathematics
Down
  1. 2. represents an opposite
  2. 4. an ordered list of numbers
  3. 5. give a share or part of a problem
  4. 6. The angles opposite each other when two lines cross
  5. 8. a science that deals with addition
  6. 9. difference in size, degree, circumstances
  7. 10. a number or algebraic expression
  8. 11. the set of values that we are allowed to plug into our function.
  9. 15. relating to methods of geometry
  10. 17. the space between two intersecting lines