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please explain A function f(x) is concave if 0 its slope (f'(x)) is always nondecreasing O a line drawn connecting two points on the curve

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A function f(x) is concave if 0 its slope (f'(x)) is always nondecreasing O a line drawn connecting two points on the curve never lies below the curve 0 -f(x) is convex 0 it is always positive

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