This table shows data from six restaurants about the number of fries in their small serving size. Restaurant O decides to increase the number of French fries in a small serving by 25%. About how many French fries are now in a small serving at Restaurant O? 84
80
20
90

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)