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)=(1)/(x^m)` . Note that it is only the y exponent with the negative exponent, not 5, so our fraction would look like this:
`(5)/(y^3)` .

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