It's the number of times you multiply a number by itself. So, 2^4 power would be four 2's multiplied together. So 2 x 2 x 2 x 2 which would be 16.
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An exponent that is a positive integer. For example, x3 has a positive exponent, while 8-5 does not.
You evaluate the powers of 10 and a exponent of positive 4.
A number to a negative exponent is the inverse of the number to the positive exponent. That is, x-a = 1/xa
Say it with a lot of sarcasm.
It will become a positive number.