You are a receptionist at a doctor's office. a patient's bill for a checkup totals $85.00. the patient's health insurance requires the patient to pay 20% of the total bill. how much should the patient pay for the checkup?

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?