65.85
9) round to the nearest tenth
10) round to the nearest whole number. 70.59
76.684
11) round to the nearest hundredth
815.755
12) round to the nearest hundredth
877.71
13) round to the nearest tenth

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)