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Evaluate composite functions: graphs & tables

The tables below show some inputs and outputs of functions gg and hh.
xx6-64-42-21-1  0~~0  2~~2
g(x){g(x)}21{-21}3{3}11{11}9{9}3{3}21{-21}
xx1-1  0~~0  2~~2  3~~3  4~~4 6~6
h(x){h(x)}5{5}2{2}2{2}5{5}10{10}26{26}
(hg)(0)=(h\circ g)(0)=