Inspect the graph of the function to determine whether it is concave up, concave down or neither, on the given interval. A cube

Question

Inspect the graph of the function to determine whether it is concave up, concave down or neither, on the given interval.
A cube function, m(x)=x^3, on (-∞,0)
On the interval (-∞o,0), the function m(x) = x is
concave up.
neither concave up or concave down.
concave down.

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