Question

Which expression is equivalent to 5y^-3? 1/125^3 1/5y^3 5/y^3 125/y^3

Answer 1

So remember the rule from negative exponents to fractions is: $x^{-m}=\frac{1}{x^m}$ . Note that it is only the y exponent with the negative exponent, not 5, so our fraction would look like this: $\frac{5}{y^3}$ .

In short, the correct answer is the third option: 5/y^3.