Please its past due and i dont understand two column geometry proofs

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? ( )

Is a positive integer raised to a negative power always positive

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?