Answer
(a) $ -4$.
(b) $ 1$.
(c) $ -6$.
(d) $ -6$.
Work Step by Step
(a) $(g\circ f)(-8)=g(f(-8))=g(2)=-4$.
(b) $(f\circ g)(-8)=f(g(-8))=f(-2)=1$.
(c) $(g\circ g)(7)=g(g(7))=g(0)=-6$.
(d) $(g\circ f)(-5)=g(f(-5))=g(4)=-6$.
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