Daredevil danny was cliff jumping. he jumped off a cliff that was 14.2 meters above the surface of the water. at the end of his jump, danny was 2.3 meters below the surface of the water. the following equation describes this situation.14.2+(−16.5)=−2.3 what does −16.5 tell us?

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)