McDonald's offers 2 free bottles of water or juices for ever 20 purchases . whataburger offers 3 free bottled waters or juices for ever 25 purchases what is wataburger's ratio of free drinks to purchased drinks? simplify if possible

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)