Let $f(x) = 1 - 6 x$, evaluate and simplify the following.

(a) $2 f(x) =$

(b) $f(x) + 5 =$

(c) $f(5 - x) =$

(d) $\big( f(x) \big)^2 =$

(e) $f(1)/x =$

(f) $\sqrt{f(x)} =$