THIS ASSINMENT IS DUE AT 11:59 TODAY AND FORGOT TO SET MY ALARM AND MISSED THIS CLASS! PLSSS HELP!

Ineed if you could explain and give me the answer you! this needs done

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)

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct