| 3 Sally has 18 coins in her purse. There are 6 pennies, 9 nickels, and 3 dimes. Without looking, she grabs one coin, puts in back, and then grabs another. What is the probability that Sally will select a nickel first and then a dime? Your answer should be simplified. OM​

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?