Answer
$-6t+1$
Work Step by Step
We are given that $f(x)=-3x+4$. In order to evaluate the function at $2t+1$, we can plug in $2t+1$ to the function and evaluate directly.
$f(2t+1)=-3(2t+1)+4=(-3)(2t)+(-3)(1)+4=-6t-3+4=-6t+1$
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