PLEASE HELP I WILL MARK BRAINLIEST HAVE A GREAT DAY:)!!

State if the two triangles are congruent. if they are, state how you know?

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 are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?