A baseball is tossed upward from the ground. The height of the ball in feet can be modeled by the function f(x) = -3x2 + 18x where x is the time in seconds after the ball is released. Approximately how long it takes the ball to hit the ground?​

I'm pretty sure it's b). i try drawing the functions out and b is the one that stands out or isnt a "line"

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.