A particle moves along the x-axis its position varies with

Question

Solve the all parts of given question:

Question: A particle moves along the x-axis. Its position varies with time according to the expression x(t) = -6t + 5t², where x is in meters and t is in seconds.

Part A: Determine the displacement of the particle in the two time intervals t = 0 to t = 1 s and t = 1 s to t = 4 s.

Part B: Calculate the average velocity during these two time intervals.

Part C: Find the instantaneous velocity of the particle at t = 2.5 s.

Please help, completely confused!! Give steps if possible for above problem.