Answer
a) 3; b) 4; c) 1; d) -2.
Work Step by Step
a) $(g\circ f)(1)=g(f(1))=g(-1)=3$
b) $(g\circ f)(5)=g(f(5))=g(1)=4$
c) $(f\circ g)(0)=f(g(0))=f(5)=1$
d) $(f\circ g)(2)=f(g(2))=f(2)=-2$
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