Choose all that correctly describe the basic properties of rigid motion.

A) Lines are taken to lines.
B) Line segments are taken to line segments of the same length.
C) Angles are taken to angles of the same measure.
D) Parallel lines are taken to parallel lines.

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)