The total revenuein thousands of dollars from sale of a popular is by the (2000x ^ 2)/(x ^ 2 + 16) Find the domain this Then find the of book years after number years

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?