Exponents and Power

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Across
  1. 5. base of number 89^12
  2. 6. value of 2^-1
  3. 7. value of 8^0
  4. 8. value od 3^2
Down
  1. 1. value of 8^2
  2. 2. the number 4 in the number 67^4
  3. 3. power of number 78^7
  4. 4. base of the number 3^57