Suppose you just purchased a digital music player and have put 15 tracks on it. after listening to them you decide that you like 3 of the songs. with the random feature on your player, each of the 15 songs is played once in random order. find the probability that among the first two songs played you will like both of them

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)