Julio has started his very own floral business. he sells centerpieces for $19.50 each. his fixed costs are $500 per month, and each centerpiece cost $8 to produce. let n represent the number of centerpieces you sell. write an equation to determine the cost, c. write another equation to determine the revenue, r.

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?