81 2/7% answer as a fraction in simplest form
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The sign at the end changes because both sides of the equation are being divided by a negative number.
Negative exponents work like this:
So, in order to evaluate a negative exponent, you simply have to invert the base, and then raise to the positive equivalent of the exponent.
As an example, here are the first three exercises:
You can work out the rest applying this logic.