Strange kinematics problem [closed]

I've encountered a strange kinematics problem in a textbook.

Rest assured, I have long finished my studies in Physics, I simply decided to get back to the basics in order to refresh my skills.

The problem is the following:
"A particle is moving along the X-axis. The coordinate of the particle is changing with relation to time according to the law: $x = c_1t + c_2t^3$, where $c_1 = 2 m/s$, $c_2 = 1 m/s^3$.
Find:
a) The velocity and acceleration of the particle at a point of time = 2s
b) The mean velocity with which the particle travels in the first 3s"

The way I see it I can sort of unofficially take $c_2$ as the jerk, $c_1$ as the initial velocity and, maybe, the initial acceleration is = 0, even though nothing is mentioned about that. So the acceleration at 2s should be $2m/s^2$ and velocity should be $3m/s$ but the answer in the textbook is $v = 14m/s$ and $a = 12m/s^2$. I don't even want to talk about b).

I have no idea how this is supposed to be solved, one because I don't see any relevant information in the problem description and, two, because nothing like this was covered in the lesson of this problem.

closed as off-topic by John Rennie, Bill N, stafusa, Kyle Kanos, Emilio PisantyOct 2 '17 at 18:39

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• Calculus! mathgenius? – Bill N Oct 1 '17 at 16:44
• @BillN, the name is supposed to be ironic. – mathgenius Oct 1 '17 at 18:13
• Regardless of whether this is formal homework assigned to you by an instructor, our guidelines for homework and exercise questions apply. Please read them carefully. – Emilio Pisanty Oct 2 '17 at 18:39