HELP ASAP, I’ll mark u if u answer first with a real answer pls don’t answer just for points this is due today

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)

How do i put 3(x+7) in distributive property

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.