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a) What is the velocity at t = 1s?

Ok, so I have an answer:

v = dx/dt = -12 + 6t

At t = 1, v = -12 + 6(1) = -6 m/s

but my problem is I want to see the steps of using the formula v = dx/dt in order to achieve -12 + 6t...

I am in phx with calc and calc is only a co-requisite for this class so im taking it while im taking physics but as you can see calc is a little behind. Where just now learning limits in calc and I was hoping someone could help me figure this out.