What is 5/8 closets to

Rewrite the following without an exponent. (5/8)-1

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half

Can someone check if i did this correct. it’s number 4 if you’re wondering.