Fast with simple 6th grade question need fast

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.