Let U be the set of all the positive integers less than 19 Let A be the set of all the even positive integers less than 19 Let B be the set of all the multiples of 3 positive integers less than 19. Define the following sets.
Remark: Note that both A and B are subsets of U. The complement of sets should be defined relative to the set U.
(a) A
(b) B
(c) A
(d) -B
(f) AnB
(g) A\B
(h) B\A
(i) -(AUB)
(j) -(ANB)

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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)