Any number above 0. Any number below 0 is negative.
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why the exponents can not be negative
Positive exponents: an = a*a*a*...*a where there are n (>0) lots of a. Negative exponents: a-n = 1/(a*a*a*...*a) where there are n (>0) lots of a.
They can be written as reciprocals with positive exponents. For example, 5-7 = (1/5)7
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All the powers and exponents of 1 are 1.The powers and exponents of any of the other numbers up to 10 are equivalent to the all the positive numbers - rational and irrational.