Puzzle of the Day!! math

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Across
  1. 3. = 3.14
  2. 5. of operation (7+14)-6+(8)
  3. 7. -
  4. 8. 4_2 =8
Down
  1. 1. _____ out of _________
  2. 2. (6+1)
  3. 4. 3 to the third power
  4. 6. 5 ______5 is 0