Answer
See below
Work Step by Step
We are given that $f(t)=e^{t-4} (t -4)^3u_{4} (t)$
Now,$F(s)= L[e^{t-4}(t-4)^3u_4(t)]\\= \dfrac{3e^{-4 s}}{(s-1)^4}$
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