In the table below are values of $f$, $f^\prime$, $g$, and $g^\prime$ for certain arguments $x$. What is the value of
$\qquad\displaystyle \dfrac{d}{dx}\big (f(x)\,g(x)\big )$ at $x=1$?
$x$ | $f(x)$ | $f^\prime (x)$ | $g(x)$ | $g^\prime (x)$
:-: | :-: | :-: | :-: | :-: | :-:
$-1$ | $-3$ | $5$ | $-2.8$ | $2.5$
$0$ | $0$ | $2$ | $0$ | $3$
$1$ | $3$ | $5$ | $2.8$ | $2.5$
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