Expression 4: "D" equals 2.5 "f" prime left parenthesis, "x" , right parenthesisD=2.5f′x
4
Expression 5: "x" equals left brace, negative 12.5 less than or equal to "y" less than or equal to 0 : 1 , 0 less than or equal to "y" less than or equal to 12.5 : 4 , right bracex=−12.5≤y≤0:1,0≤y≤12.5:4
5
Expression 6: "x" equals left brace, negative 12.5 less than or equal to "y" less than or equal to 0 : 3 , 0 less than or equal to "y" less than or equal to 12.5 : 5 , right bracex=−12.5≤y≤0:3,0≤y≤12.5:5
6
Expression 7: "W" equals "D" plus "P" plus "I"W=D+P+I