The following ordered pairs (x, y) define the relation q.

q = {(-1, 4), (-2, 3), (4, 4), (2, -2)}

is q a function?

a) no, because there is more than one x value from some y values

b) yes, because there is exactly one y value for every x value

c) yes, because there is exactly one x value for every y value

d) no, because there is more than one y value for every x value

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)