The City Council of a large northern metropolis promised its citizens that in the event of snow, all major roads connecting the city to its sheltersshelters would remain open. The City Council did not keep its promise during the first blizzard of the season. Write a statement that represents the situation.

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)