Math Basic Symbols

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Across
  1. 1. exponent, a^b
  2. 6. calculate expression inside first, ()
  3. 7. both minus and plus operations,∓
  4. 8. 4√a< - 4√a - 4√a - 4√a = a, 4√a
  5. 9. approximation, ≈
  6. 13. √a - √a = a, √a
  7. 14. 1ppm = 1/1000000, ppm
  8. 15. multiplication, *
Down
  1. 2. equal, =
  2. 3. greater than or equal to, ≥
  3. 4. inequality, ≠
  4. 5. greater than, >
  5. 10. calculate expression inside first, []
  6. 11. decimal point, .
  7. 12. 3√a - 3√a - 3√a = a, 3√a