Answer
(a) $f(s)=4 s$.
(b) $f(s+4)=4 s+16$.
(c) $f(s)+4=4 s+4$.
(d) Meters.
Work Step by Step
(a) $P=f(s)=4 s$.
(b) $f(s+4)=4(s+4)=4 s+16$. This the perimeter of a square whose side is four meters larger than $s$.
(c) $f(s)+4=4 s+4$. This is the perimeter of a square whose side is $s$, plus four meters.
(d) Meters.
