22 divided by 4/5
please help me every time i do this it isn’t right

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)

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal

Complete the equation of the live through (-1,6) (7,-2)