Answer this math only if you know the answer! 40 points and brianliest!

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

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)

Someone which statements are true? check all that apply.