Does anyone know how to do this and what is it

Which of the following is true for the relation f(x)=2x^2+1

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

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?