Math Puzzle

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Across
  1. 2. René Descartes introduced what in the 17h century?
  2. 3. alternative way to solve quadratic equation
  3. 11. what formula found in 1594 bye Simon Stevin?
  4. 12. What is this formula "y = x3" for?
  5. 13. what is the formula used for solving quadratic equation?
  6. 15. when a^0=
  7. 16. who is the founder of coordinate geometry?
  8. 19. who is the founder of linear inequalities?
  9. 20. we can use ..... to solve length of a line segment
Down
  1. 1. How do you solve this equation "a^m : a^n"?
  2. 4. How do you solve this equation "a^m x a^n "?
  3. 5. who is the founder of indices?
  4. 6. who is the founder of graph of function?
  5. 7. alternative way to solve quadratic equation
  6. 8. what is this formula "y=mx+c"
  7. 9. ">" this symbols means?
  8. 10. What term did Samuel Jeake introduced in 1696
  9. 14. "<" this symbols means?
  10. 17. who is the founder of quadratic equation?
  11. 18. √ this symbol is a ?