Answer
a. $1$
b. $2$
c. $-2$
d. $0$
e. $-1$
f. $0$
Work Step by Step
a. $ f(g(-1))=f(1)=1$
b. $ g(f(0))=g(-1)=2$
c. $ f(f(-1))=f(0)=-2$
d. $ g(g(2))=g(0)=0$
e. $ g(f(-2))=g(1)=-1$
f. $ f(g(1))=f(-1)=0$
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