The following table shows the number of classes that each teacher in the math department at Wilburton High School teaches.
Teacher Number of classes
Mr. Linn 444
Mrs. Ross 333
Mr. Kelly 555
Ms. Moss 999
Mr. Jackson 333
Mrs. Jackson 444
Find the median number of classes.

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)