Expression 7: "s" left parenthesis, "t" , right parenthesis equals left parenthesis, StartFraction, 1 Over left parenthesis, 1 plus "e" Superscript, negative "t" , Baseline , right parenthesis , EndFraction , right parenthesisst=11+e−t
7
Expression 8: "g" left parenthesis, "x" , right parenthesis equals left parenthesis, StartFraction, 1 Over left parenthesis, 1 plus "e" Superscript, negative "z" Subscript, 1 , Baseline , Baseline , right parenthesis , EndFraction , right parenthesisgx=11+e−z1