I need this help me please

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

We just started the introduction into circles and i have no idea how to do this.

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases