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81 = 92
No, -81 is not an irrational number because it can be represented in the form x/y = -81
In index form, 90 can be expressed as 9^2. This is because the index form represents the number as a base raised to a power, where the base is 9 and the power is 2. This is equivalent to 9 * 9, which equals 81.
In binary form it is 1010001.
Just writing "81" is mathematical enough for my taste. After all, that's a number, and numbers are mathematical.