Answer
f'(x) = 0
Work Step by Step
f(x) = 12
f'(x) = $\lim\limits_{ Δx\to 0}$ $\frac{f(x + Δx) - f(x)}{Δx}$
= $\lim\limits_{ Δx\to 0}$ $\frac{12 - 12}{Δx}$
= $\lim\limits_{ Δx\to 0}$ $\frac{0}{Δx}$ = 0
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