(07.06 LC) If the least value of n is 4, which inequality best shows all the possible values of n? Select one: a. n ≤ 4 b. n ≥ 4 c. n 4 Please help!

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)

Need asap. solve for the following inequality

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.