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x = 1.92 + 3.09t − 1.00t2,

Where x is in meters and t is in seconds?

a) find the position of the particle at t=3.4s

-I get this part. (0.866m)

b) find its velocity at t=3.4s

-this is where I am having trouble. I know I need to use calculus to take the derivative, but my physics class is actually ahead of my cal 1 class so I'm struggling a bit trying to conceptualize how to plug this in to the derivative definition.

c) find its acceleration at t=3.4s

I know its a basic problem, and you guys probably see this a lot, but I appreciate your feedback.