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When a number is raised to a negative exponent, it indicates that the number should be taken as the reciprocal of the same number raised to the positive exponent. In this case, 9 raised to the power of -2 is equal to 1/(9^2) which simplifies to 1/81.
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3-2 = 1/32 = 1/9
An exponent is 1; 16 = 16^1
4 is the base, 2 is the exponent.
Two to the sixth power. 8 with an exponent of 2 equals 64 and 4 with an exponent of 3 equals 64