Astore had a sale on art supplies. the price p of each item was marked down 60%. which expression represents the new price

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

What is the total surface area of this square pyramid?