Answer
$f(g(h(x)))=13-3x$
Work Step by Step
$f(x)=x+1, g(x)=3x, h(x)=4-x$
$f(g(h(x)))$
$f(g(4-x))$
$f(3(4-x))$
$f(12-3x)$
$(12-3x)+1$
$13-3x$
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