Please help me and use laws of exponents​

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)

How to use order of operation in 20 divide by 4 multiply 5 = 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?