Over which interval is the graph of f(x) = 1/2 x2 + 5x + 6 increasing?
a) (–6.5, ∞)
b) (–5, ∞)
c) (–∞, –5)
d) (–∞, –6.5)

If you look at the graph of f(x) = 1/2 x2 + 5x + 6, you can see that it is increasing at interval (-5, ∞).

So the answer would be B. 

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