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Regina wants to cover one wall of her room with wallpaper. the wall is 9 feet high and 15 feet wide. there is a doorway in the wall that is 3 feet wide and 7 feet tall. how many square feet of wallpaper will she need to buy?

Sagot :

First you need to find area of the wall : 9x15
Then Find the area of the door : 7x3
After that you subtract the area of the door from the wall
and you should get____??