#### Answer

Refer to the answer below.

#### Work Step by Step

The functions $f(x)$ and $g(x)$ are known as inverse functions. Thus, we simplify
$(f\circ g) (x)=(g\circ f) (x)$ or, $f[g(x)]=g[f(x)]$
as follows:
$(f\circ g) x =f[g(x)]=f(\dfrac{1}{2}x)=f (\dfrac{x}{2})=2(0.5x)=(2)(\dfrac{x}{2}) =x$
and
$(g\circ f) x = g[f(x)]=f(\dfrac{1}{2}x)=g(2x)= [\dfrac{1}{2}](2x)=x$