What is the answer and how do you solve this? ?

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? ( )

Find the solution of each of the following.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.