The height of each story in a hotel is feet. the height is measured from the ceiling to the floor. the hotel has 2 underground levels that are used as banquet halls. stephen is a waiter who works two levels below ground. at what elevation are stephen’s feet? assume the ground level of the hotel is at 0 feet.

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)