e-2 = 1/e2
≈ 0.1353
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It is: 2 to the power of 8 = 256
The value of exponential e is between 2 and 3. The exact number is 2.7182818284.
Just write it as 2 to the power n. You can't simplify that, and you can only calculate a specific value if you know the value of n.
(33)2.
2½ ie 2 to the power of one-half. The power "one-half" applied to any value signifies that value's square root. Do not confuse with the power "-1" which indicates the reciprocal of the given value.