What is the answer to 20k< 30

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

Hi my sisters and brothers can tell me the answer because i don’t understand the question

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section