นิพจน์ 3: "g" left parenthesis, "x" , right parenthesis equals 1 half "x" plus 10 left brace, negative 20 less than or equal to "x" less than or equal to 0 , right bracegx=12x+10−20≤x≤0
3
Move the blue point the see the area of the cross-section at each height, indicated by the number 'A' below.