Would you please assist me in understanding this problem?

The instantaneous position of a particle along the x-axis is given by: x(t) = 9.75 + (1.5?3 t3; x in meters and tin seconds. Determine a. the average velocity during the time interval t = 3.00 s to t = 5.00 s b. the instantaneous velocity at t = 3.00 s c. the instantaneous velocity at t = 6.00 5 cl. the average acceleration during the time interval t = 3.00 s to t = 5.00 the instantaneous acceleration at t = 2.00 s F\