In Problems 13–16, find the functions f ∘ g and g ∘ f and give their domains.
13. 
14. f(x) = x2 − x + 5, g(x) = −x + 4
15. 
16. 
In Problems 17–22, find the functions f ∘ g and g ∘ f.
17. 
18. f(x) = x − 1, g(x) = x3
19. 
20.
21.
22.
In ...
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