Help important TIMED ASAP explain

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?

Find the area between y=e^x and y=e^2x over [0,1]

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?