During a school fundraiser, Nick sold 12 coupon books that each cost the same amount. He earned a total of $204. Which equation could be used to find the cost c of each coupon book?

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?