0.081 to simplest form

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

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