Estimating the area: [tex]x = (20 \times 8)(13 \times 8) \\ x = 264[/tex] Calculating wallpaper: [tex]x = (264 \times 1.05) \div 35 \\ x = 7.92 \\ x = 8[/tex] we round up here because they will need a full roll to complete the room. Since they can't buy 7.92 rolls, they must buy 8.
