What is -c-d where c is equal to -3 and d is equal to -6

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?

Ihonestly have no clue if it's each or none.

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid