Mathematics Words puzzle

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Across
  1. 2. is the power that is written after a number at the top that it is two
  2. 4. is like a formula
  3. 5. is a messure of a chance
  4. 7. is the power that is written after a number at the top that it is three
  5. 8. sign of direct and inverse propotion
  6. 9. is to find the factors of an expression
  7. 10. is a way to write equations connecting two quantities
  8. 11. is to extend an expression and make it larger
Down
  1. 1. is the Letters in an expessuion
  2. 3. is an expression formed from a variable and constant
  3. 6. is to make an expression its simplest form