Answer
(a) $6x$
(b) $t^{3}$
Work Step by Step
(a) $F(x)=6x$ is an antiderivative as $F'(x)=6=f(x)$.
(b) $G(t)=t^{3}$ is an antiderivative as $G'(t)=3t^{2}=g(t)$.
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