Expression 3: "c" equals 1 minus 0.5 times "e" Superscript, left parenthesis, negative "x" times 0.8 3 , right parenthesis , Baseline left brace, "x" greater than 0 , right bracec=1−0.5·e−x·0.83x>0
3
Expression 4: "d" equals left parenthesis, "b" minus "c" , right parenthesis times 100d=b−c·100