Expression 4: "g" left parenthesis, "x" , right parenthesis equals "f" Subscript, "c" , Baseline left parenthesis, "x" , right parenthesis minus "f" Subscript, "c" 1 , Baseline left parenthesis, "x" , right parenthesisgx=fcx−fc1x
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Expression 5: "f" Subscript, "c" 1 , Baseline left parenthesis, "x" , right parenthesis less than or equal to "y" less than or equal to "f" Subscript, "c" , Baseline left parenthesis, "x" , right parenthesisfc1x≤y≤fcx
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Expression 6: left parenthesis, 3 , 1.5 , right parenthesis3,1.5
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Expression 7: left parenthesis, 2 , negative 1.5 , right parenthesis2,−1.5
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Expression 8: "X" equals left parenthesis, "c" , 0 , right parenthesisX=c,0