A race car moves such that its position fits the

Question

A race car moves such that its position fits the relationship   x(t) = (3.1 m/s) t + (0.98m/s³) t³
where x is measured in meters and t in seconds.

(a) approximate the instantaneous velocity at 3.3 s, using acentered time interval of 0.1 s
(b) use a 0.2 s interval centered at 3.3 s to approximate theinstantaneous velocity at 3.3 s. Answer in units of m/s
(c) find the average velocity during the 3.3 s. Answer inunits of m/s