Let 40 x 55 = n. which of the choices shown is also equal to n? a) (550 x 40) b) (4 x 50) + (40 x 5) c) (50 x 40) + (50 x 40) d) (10 x 55) + (10 x 55) + (10 x 55) + (10 x 55)

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?