Suppose that f(x) is differentiable for x > 0, y = 2x + 1 is the tangent line to the graph of f at x = Which statement must be correct? Of is not concave down on (1,2). Ofis concave down on (1,2). fis concave up on (1,2). The concavity of ƒ on (1,2) cannot be determined from the given information. Of is not concave up on (1,2).

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