given the first four terms and the number of terms of the geometric sequence series, find the finite sum. 1-4+16-64..., n=9 . please no links (:

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 t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=