you decide to go put for a walk. You walk 8km to the north in 2 hours, then you walk 3km to the south in 1 hour. what is your average speed for the entire walk what is your average velocity for the entire walk why do they have different average speed and velocity​

When y’all answer can y’all explain too !

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)

What function has a range {yly< 5}? question on picture above^