I don't know what it equals

Find the distance between (7,-6) and (-3,-9)

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?

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?