Abedroom is 10 ft by 12 how much does it cost to wallpaper this room if the wallpaper costs 1.53 per ft?

If the room is 10 by 12 that means each wall is 10 by 12 (I'm assuming) so the area of each wall is 120 ft and since there are 4 of them the total area of the walls is 480 ft and if wallpaper costs 1.53 per ft, it costs 480 * 1.53 or $734.40

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the answer

b. they are parallel and will never intersect.