Answer
See below.
Work Step by Step
As we can see from the graph:
a) $f(x)=20$ when $x=5$
b) $f(x)=60$ when $x=-15$
c) $f(x)=0$ when $x=15$
d) $f(x)\gt20$ when $x\lt5$
e) $f(x)\leq60$ when $x\geq-15$
f) $0\lt f(x)\lt60$ when $-15\lt x\lt15$