Asap please help i really need this question answered

Find the area of the unshaded square

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

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?