式30: "y" equals negative 0.1 left parenthesis, "x" plus 21 , right parenthesis squared minus 18.3 left brace, negative 24.5 less than "x" less than negative 19 , right bracey=−0.1x+212−18.3−24.5<x<−19
30
式31: "y" equals negative 0.1 left parenthesis, "x" plus 21 , right parenthesis squared minus 19. left brace, negative 24.6 5 less than "x" less than negative 22 , right bracey=−0.1x+212−19.−24.65<x<−22
31
式32: "y" equals 0.5sine left parenthesis, StartFraction, 1 Over 1.6 , EndFraction "x" minus 15.6 , right parenthesis minus 19.6 left brace, negative 20 less than "x" less than negative 12.7 , right bracey=0.5sin11.6x−15.6−19.6−20<x<−12.7
