Can someone help me with this please? I'm having a little trouble lol yedil32370 you're not allowed to answer this question with your fake answer that leads people to a work out site. If you want to ACTUALLY answer this correctly, then I will allow you to do so.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)