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92 = 81
53 = 125 ====
3^4 = 81
81 can be written as 8.10 × 101
34 = 81
12,157,665,459,056,928,801
(-3)4 = 81
23 or 81
81 = 3^4 (or 3 to the fourth power)
92
The relevant exponent is -2.