The circle graph shows the number of students at a local high school. The lighter shaded portion shows the number of students who packed their lunch vs the darker portion showing the number of students who purchased food from the cafeteria. There is a total of 2,712 students who attend this high school.

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)