So remember the rule from negative exponents to fractions is: [tex] x^{-m}=\frac{1}{x^m} [/tex] . Note that it is only the y exponent with the negative exponent, not 5, so our fraction would look like this: [tex] \frac{5}{y^3} [/tex] .
In short, the correct answer is the third option: 5/y^3.
