Matt jogs at a constant rate of 6 per second. use this rate to complete the scale line

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Which is a graph of a proportional relationship?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)