Suppose you have 30 cds. you know that you have 11 more cds than your friend. write and solve an equation to find the number of cds your friend has. a. n – 11 = 30; 41 b. 30 + n = 11; –19 c. 30 + 11 = n; 41 d. n + 11 = 30; 19

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?