math terminology

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Across
  1. 3. a formula to solve polynomial with degree 2
  2. 5. the observation which has the highest frequecy
  3. 6. solution of a polynomial
  4. 9. means possibility
  5. 10. average of the numbers and is calculated by dividing the sum of given numbers by the total number of numbers.
  6. 11. a sequence of numbers in which each differs from the preceding one by a constant quantity
  7. 12. an equation with one variable
Down
  1. 1. ordered pair of numbers
  2. 2. 1/4 of a circle
  3. 4. the portion (or part) of the circular region enclosed by two radii and the corresponding arc
  4. 7. area between chord and corresponding arc
  5. 8. the middle value of a sorted list of numbers