Karen is making pasta. She can choose from two different sauces: white sauce or red sauce. She can choose between three types of meat: sausage, ham, or meatballs. Finally, she can choose between three types of cheese: swiss, cheddar, or parmesan.

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)