Expression 4: left parenthesis, 1 plus StartFraction, "x" Over 9 "S" , EndFraction , right parenthesis to the negative 1st power left brace, "x" greater than 0 , right brace1+x9S−1x>0
4
Expression 5: left parenthesis, 1 plus StartFraction, 19 Over 81 , EndFraction StartFraction, "x" Over "S" , EndFraction , right parenthesis Superscript, negative 0.5 , Baseline left brace, "x" greater than 0 , right brace1+1981xS−0.5x>0