7 10 points
Mark has x comic books. Paul has 2 times as many comic books as Mark. Juan has 15 comic books.
Which expression represents how many comic books they have in all?

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?