Mathematics Crossword Puzzle!!!

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Across
  1. 3. If 72x is a perfect cube, then x=_____
  2. 6. the no. of diagonals in a triangle
  3. 7. on which axis does the point (0,-6) lie?
  4. 9. the point where x axis and y axis meet is called_____
  5. 10. Find x: (81)^-4 รท (729)^2-x= (9)^4x
Down
  1. 1. state true or false: 100,000,000,000 is a perfect square
  2. 2. Find the square root of 4096
  3. 4. a quadrilateral with one pair of parallel sides.
  4. 5. answer in yes or no: is 0.3 the multiplicative inverse of (3*3)+1/3?
  5. 8. -2/3*3/5+5/2-3/5*1/6
  6. 11. the sum of the digits of a two digit no. is 12. If the new no. formed is greater than the original no. by 18, find the no.