Eight cards are picked three, four, five, six, seven, eight, nine, and 10 such that each card has exactly one of these numbers a card is picked without looking find each probability write each answer is a fraction and decimal and a percent P(9)

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?