Many graphs that appear concave from one side will appear convex from the other. A smooth graph is generally described as concave if it is increasing AND if the rate of increase is also increasing. In terms of calculus this requires the first and second derivative to be positive.
A concave polygon is one in which at least one of the vertices forms a reflex angle.
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If you can differentiate the function, then you can tell that the graph is concave down if the second derivative is negative over the range examined. As an example: for f(x) = -x2, f'(x) = -2x and f"(x) = -2 < 0, so the function will be everywhere concave down.
That's a point where the curve of a graph changes from "concave upward" to "concave downward", or vice versa.
The answer depends on what is plotted on the graph and what is happening with the acceleration then.
it looks like any oyher graph u now EDIT: It looks like any other graph you know.
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