cmb afda

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Across
  1. 3. answer to addition
  2. 5. number in the middle
  3. 6. high minus low
  4. 7. 5x^2+7+3x
  5. 9. 4x+8
  6. 11. a+b=b+a
  7. 12. ac=ac
  8. 13. y-y/x-x
Down
  1. 1. a=b b=a
  2. 2. ((x+x)/2,(y+y)/2)
  3. 4. average
  4. 8. (a+b)+c=a+(b+c)
  5. 10. most often