Mathematic's puzzle

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Across
  1. 3. each pair and the remaining digit in the long division of square numbers
  2. 5. price the amount at which an article is sold
  3. 6. a triangular pyramid
  4. 8. a parellogram having a pair of adjacent sides equal
  5. 9. price the amount at which the article is made
  6. 11. graph it displays data that changes continuously over periods of time
Down
  1. 1. formula F+V-E=2
  2. 2. Numbers whose dot patterns can be arranged as triangles
  3. 4. amount of space occupied by a solid
  4. 7. a visual representation of data collected
  5. 10. The point at which x axis and y axis intersect