The green gobbler a wildly unpopular super mix 3 L of yellow paint with finally do some blue paint to make 8 L a special green paint first costume. I need a question that relates why not feel pain in liters in Beamer pooping and leaders need to make the green gobbler special green paint

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)