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belka [17]
3 years ago
13

Why isn't D the answer? Isn't it also positive and concave up?

Mathematics
1 answer:
ArbitrLikvidat [17]3 years ago
7 0

Step-by-step explanation:

At d, f'(x) is increasing (concave up), but it is not positive.  The tangent line at that point has a negative slope.

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