Number & Algebra

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Across
  1. 2. Multiplied by itself?
  2. 3. 2 is the?
  3. 6. Product of
  4. 10. Number less than zero?
  5. 11. 7, -6, 5, -4 are what type of numbers?
  6. 12. 5 is the ________ of -5
  7. 15. Used three times as a factor?
Down
  1. 1. The Zero index states that any number to the power of zero is equal to?
  2. 2. To put in place of?
  3. 4. A letter to represent a number
  4. 5. A number greater than zero?
  5. 7. 2^5, 5 is the?
  6. 8. 0, 1, 2, 3 - are
  7. 9. Sum of
  8. 13. A number that only has one and itself as divisors
  9. 14. Find the difference?