Which statement best explains why Kyle's survey may be biased? O It wasn't possible for students to volunteer to take the survey.
Kyle gave the survey on paper instead of electronically.
Two out of every three students entering Kyle's class didn't receive the survey.
Only students who are taking one of Kyle's classes received the survey.

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)