After his hike, brian calculated his average hiking speed
to be 3.62 miles per hour.
how far did brian hike?
o
1.086 miles
brian's activity time (hours)
10.86 miles
3
100.86 miles
108.6 miles
1.45
hiking
mountain biking
horseback riding
cross-country skiing
1.2
0.75

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)