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spoopyvampire: Solving for d.f(x)/f(x): If f(x) = 1/5x5 – 1/4x4 – 2/3x3 – 11x d.f(x) = x4 – x3 – 2x2 – 11 when x = 3, d.f(x) = 34 – 33 – 2 x 32 – 11 = 81 – 27 – 18 – 11 = $25 on the giftcard