In the table below are values of $f$, $f'$, $g$, and $g'$ at $x=1$.
**What is the value of $\displaystyle \dfrac{d}{dx}\big (2\,f(x)- 5\,g(x)\big )$ when $x=1$ ?**
$\qquad$[[☃ input-number 1]]
$x$ | $f(x)$ | $f\,^\prime (x)$ | $g(x)$ | $g\,^\prime (x)$
:-: | :-: | :-: | :-: | :-: | :-:
$1$ | $4$ | $0$ | $1$ | $0.8$