Expression 4: "g" left parenthesis, "x" , right parenthesis less than "y" less than "f" left parenthesis, "x" , right parenthesis left brace, ln left parenthesis, 7 , right parenthesis minus 1 less than "x" less than ln 7 , right bracegx<y<fxln7−1<x<ln7
4
Expression 5: 0 less than "y" less than "f" left parenthesis, "x" , right parenthesis left brace, "x" less than ln 7 minus 1 , right brace0<y<fxx<ln7−1