algebra terms

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Across
  1. 4. going down hill
  2. 7. a number on its own that don't change
  3. 9. where a graph crosses
  4. 12. distance from zero
  5. 13. group of terms
  6. 14. used to multiply a variable
Down
  1. 1. terms with the same variables
  2. 2. a polynomial with two terms
  3. 3. going down
  4. 5. an expression with one or more terms
  5. 6. a letter
  6. 8. a polynomial with three terms
  7. 10. how many times a variable is
  8. 11. a single number or variable multiplied together
  9. 15. a number or variable multiplied as part of a term