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**1. I need to find where the graph of f is CU or CD given the graph of f ' .**

**2. So far I have found that F inc. on (2,4) and (6,9). F has a local max at 4. F has a local min at 2 and 6.**

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- Thread starter Econometricia
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When f' is increasing, i.e. when f''>0, f is concave up, and conversely.

- #3

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you have to find f '' then you can judge concavity

if f'' is bigger than 0 then it's concave up if f'' is smaller than 0 than it is concave down

if f'' is bigger than 0 then it's concave up if f'' is smaller than 0 than it is concave down

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