2000003103

Which of the functions $f$, $g$, $h$, $k$, $m$, $n$ are decreasing, have minimum and are bounded functions? $$f(x)=-3,x\in \mathbb{R}$$ $$g(x)=-0.3x-3,x\in [0;6]$$ $$h(x)=-0.4x+5,x\in (-\mathrm{\infty };3]$$ $$k(x)=3x+2,x\in [-3;5)$$ $$m(x)=-12x+4,x\in [0;\mathrm{\infty })$$ $$n(x)=-2x+4,x\in (0;7]$$