An arithmetic sequence has a common difference of 2, and contains the value 86 at some point in the sequence. Which of the following explicit formulas could represent this sequence?

Can someone me with these two circle theorem questions asap?

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?

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3