Marcules

Hello,
I have this velocity v. time parabola graph (which i attached to this post) and what I am suppose to make an acceleration v. time graph from it. Its tuff to see but there are specific little points on the curve that were plotted. the velocity isn't constant which probably means I have to find the instantanous acceleration at each point. I'm suppose to use tangent lines(I think) and I'm a little confused on what they are exactly. My best guess is that tangent lines are lines used just to find the slope. What I'm thinking is that I make a line between two points on my graph and calculate the slope, right? So all I have to do is find the slope between every set of points on my velocity v. time graph and then plot my acceleration v. time graph from these slopes I found? I also have to describe the acceleration which I'm pretty sure will be easy once I finish this graph. Please take a look and see if you have the answer to my question. Thanks for your time.......

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