Acode is made up of 1 letter, out of a possible 26, in the first position. one digit, 0–9, occupies each of the second and third positions. the digit cannot be repeated. how many possible outcomes exist?

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?