VERY QUICK QUESTION. PLZ HELP

If a || b and e || f , what if the value of y ?

What is x3+3x2−16x−48 divided by x−1?

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?