Hey I need help finding the slope

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? ( )

For which pair of functions is (gof)(a)=|a|-2?

What is the range? can’t seem to find it out