The walls, ceiling and floor of a cubic room need to be painted. the edge length for the cube is 3 m. what is the total surface area that will be painted in the room?

27 m²

30 m²

36 m²

54 m²

Since the shape is a cube, we know that all sides are the same length and therefore all faces and bases will have the same area.
A cube will have a total of 6 faces/bases.
The area of each one is 3 * 3 = 9 m^2
9m^2 * 6 = 54 m^2
The total surface area to be painted is 54m^2