Question: how to calculate a negative fraction exponent?
Answer: The -1/3 exponent means take the third root of the reciprocal. So remember that any number when divided by 1 is equal to the number itself. The negative exponent means take the reciprocal, or flip the fraction, so, ( (-27)^-1/3) / 1 = 1 / ( (-27)^1/3), and the negative exponent is now a positive exponent.