Answer
$(f\circ g\circ h)(x)=-3x+13$
Work Step by Step
We are given $f(x)=x+1$, $g(x)=3x$, and $h(x)=4-x$.
So $(f\circ g\circ h)(x)=f(g(h(x)))=f(g(4-x))=f(3(4-x))=3(4-x)+1\\=12-3x+1=-3x+13$.
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