At which one of the following times is the angle between the hands of a clock exactly one straight angle? a)12: 00 b)12: 30 b)3: 45 d).6: 00 show ! : )

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?