Expression 4: "f" left parenthesis, "t" , right parenthesis equals "s" "t" left parenthesis, "l" times left parenthesis, 1 minus "t" , right parenthesis plus "h" "t" , right parenthesis left brace, 0 less than or equal to "t" less than or equal to 1 , right braceft=stl·1−t+ht0≤t≤1
4
Expression 5: "y" equals 100 "f" left parenthesis, StartFraction, "x" Over 100 , EndFraction , right parenthesisy=100fx100