Determine whether the following functions are concave or convex at x = 3. (a) f(x)=7x + 19x-24

Determine whether the following functions are concave or convex at x = 3.

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(a) f(x)=7x + 19x-24 (c) f(x)=(4-9x)3 (b) f(x)=5x-81x + 11x+97 (d) f(x)=(3x4-7)