Answer
a) 5; b) 11; c) 0; d) 0; e) 1; f) 7.
Work Step by Step
a) $(f\circ g)(1)=f(g(1))=f(0)=5$
b) $(f\circ g)(2)=f(g(2))=f(-3)=11$
c) $(g\circ f)(2)=g(f(2))=g(1)=0$
d) $(g\circ f)(3)=g(f(3))=g(-1)=0$
e) $(g\circ g)(1)=g(g(1))=g(0)=1$
f) $(f\circ f)(3)=f(f(3))=f(-1)=7$
