Maths

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Across
  1. 3. a name of angle starts with O
  2. 4. x + y and y + x is an example of
  3. 5. is a name of graph that is represented by lines
  4. 6. is a name of graph starts with B
  5. 8. represented by the letter Z
Down
  1. 1. in x^2 x is a ?
  2. 2. antonym of negative
  3. 7. the first half of rational