Help please is for today

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

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?