Maths holiday homework

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Across
  1. 4. other name of y-axis
  2. 6. the intersection point of y-axis and x-axis
  3. 7. the mathematical expression involving the sum of powers in one or more variables multiplied by coefficients
  4. 9. a polynomial of degree one
  5. 10. a polynomial with 1 term
  6. 11. division of coordinate axes into four parts
Down
  1. 1. the plane that consists of axes and the quadrants
  2. 2. the degree of non-zero constant polynomial
  3. 3. a polynomial of degree two
  4. 5. a polynomial with 3 terms
  5. 8. other name of x-coordinate