Expression 4: "g" left parenthesis, "x" , right parenthesis equals left brace, "x" less than or equal to 9 : "x" , 9 minus left parenthesis, "x" minus 9 , right parenthesis , right bracegx=x≤9:x,9−x−9
4
Expression 5: "N" equals "g" left parenthesis, "X" , right parenthesisN=gX