The position of a particle moving along the x

The position of a particle moving along the x axis varies in time according to the expression x = 3t2, where x is in meters and t is in seconds. Evaluate its position
(a) At t = 3.00 s and
(b) At 3.00 s + ∆t
(c) Evaluate the limit of ∆x/ ∆t as ∆t approaches zero, to find the velocity at t = 3.00 s
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