How many different prisms can you make using 18 centimetre cubes?

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

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Which expression is equivalent to 8(k + m) − 15(2k + 5m)?