PLEASE HELP ITS A TEST!!!

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two

Which will form a composite function?

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?