I am going to say positive. If it is 5 -2 well that is 3, which is positive. Possibly you mean 5 with a small -2 slightly raised after it. That means 5 raised to the power of -2. Any time you have a negative exponent, you can take the reciprocal, and make it positve. So 5^-2 {the ^ symbol means to raise the power of} can be rewritten as 1/(5^2), which is 1/25. And this is a positive number as well.
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