A special variety of wallpaper covers only 60 square feet per roll. How many single rolls are needed to paper a room measuring 19' by 12' by 8'6"? Show all work.

9 rolls

Step-by-step explanation:

The perimeter of the room measures 2 (19' + 12') = 62', so the area of the walls is ...

(62 ft) (8.5 ft) = 527 ft²

We know that 8 rolls will cover 8*60 ft² = 480 ft², and 9 rolls will cover 540 ft², so we will need 9 rolls to cover the walls.