Identify whether the decimal expansion of each fraction is terminating or repeating

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

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?

Can someone tell me if this is perpendicular? !